Since you refer to the PC days. I've gotten used to the idea that a lot of device needs a ctrl-alt-delete an a daily basis. Including our Hubitat hubs themselves, which in my experience lose their minds after a few days (YMMV) . 
btw, I can't say I would be surprised if the MS600 suffer from the same kind of issue as the Linptech. Most all use the same HiLink LD2410 24GHZ sensors which is where I think the core problem lays. Holding on to your existing Linptechs would be wise decision.
So far MS600 are stable but it is stiil too soon to say something conclusive. Even if MS600 is using the same LD2410 it is impossible to say the problem is related to the LD2410. It could be anything including buggy Linptech firmware.
BTW, my setup is very stable. I absolutely don't need to reboot neither C7, C8, HA nor any devices except when something needs to be updated.
I wouldn't say it is impossible to determine if the problem is related to the LD2410 or not. Pop open the case, and probe the OUT pin of the LD2410. That is the signal from the 24GHZ sensor module that signals to the microcontroller if here is movement or not. i.e. the interrupt signal. It is 5V logic high.
look at section 4.2 of this document. :
https://fccid.io/2AD56HLK-LD2410-P/User-Manual/User-Manual-6619974.pdf#:~:text=The%20HLK-LD2410%20module%20directly%20outputs%20the%20detected%20target,the%20serial%20port%20according%20to%20the%20specified%20protocol.
here is a tear down of the ES1.
Sure, this can be done. But ... I don't want to wait 4-6 weeks for failure plus (or actually minus) I am too old and too lazy for performing this testing.
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lets assume it fails before you do. 
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Copy that... 
Since I was adding another Linptech's Presence Sensor I went with changing sensitivity settings instead of the weekly reboot. It just failed after 24 days. Just changed it to the power cycling rule like the other one I have that has not froze since the weekly reboots.
Just reporting to add what @danabw saw in case you have the sensor and want to know what has worked and what has not for others.
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How do you determine it is stuck? By observing it being non-responsive or do you have some other test?
In my case, the lights stay on long after they should've turned off.
On the corresponding smart switch for those lights, I added a kill-motion command to the bottom-tap action. That way, turning the lights off via switch always ensures the Linptech's motion gets off'd too.
Rebooting the Linptech weekly via smart plug definitely helps overall, but its motion still hangs up once in a while.
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Maybe rebooting them more frequently will resolve it? I have a nightly reboot, and I don't see anything staying on when it shouldn't...
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I actually do the power reboot 2x/week -- I've considered a nightly reboot, but I'm not convinced that'll solve all quirks. I guess I could try, but if they continue, then how far down this rabbit hole do we go... Rebooting every 12 hrs? 4 hrs? 30 minutes? 
My kill-switch works good enough for the occaissional hiccup.
At the end of the day, this is not a Caseta or Hue -quality product, so having such performance/reliability expectations simply isn't realistic -- it just is what it is 
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In my case a weekly reboot has been my sweet spot - zero issues w/that schedule. Def think that's a YMMV thing and there is no reboot frequency that is perfect for everyone.
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Anything more frequent than nightly doesn't make sense since it can reboot mid-operation. I didn't notice any freezes since added the nightly reboot. Having physical switches (and voice, and app, and Telegram bot) sure helps
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I have 12 of these and I don't think I have ever seen this behavior. Are you guys rebooting your hubs fairly often??
The only time I check on mine is after a reboot or hubitat version update. I usually have to restart at least one of them after a reboot before they will start reporting again.
Mine just likes to stay locked up as Active once in a while when it should've gone inactive. It's definitely not anything environmental in my case, and I've futzed around with pretty much every combination of sensitivity settings -- none of that moves the needle one way or the other.
For me, a periodic power-cycle does noticebly reduce how often that happens, so I just roll with that.
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It's not about the hub, the sensors themselves stop reporting.
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Typically I only reboot my hub when I have a platform update. Everything, except for these sensors, runs fine so I haven't had a reason to do any more frequent reboots.
I think the one constant in this whole arena of home automation is YMMV. The fact that some or probably most of us experience this issue at some level with far fewer devices, and you never have with 12, kinda illustrates that. I wish I were in your shoes.
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Interesting update on these in my home - I originally bought one, loved it, bought 3 more, and then found they would stop reporting at a rate of about 1-2x a week randomly across them (so each one maybe once every 2 weeks). I finally gave up and stopped using them for most of my automations. Fast forward 6 months, I upgraded from C7 to C8 Pro and I decided to try one of them out again that was still plugged in and it worked for about 2 weeks, so I re-paired the rest of them, and a few more weeks later none of them have stopped reporting. Maybe it's a hub specific thing, or maybe how my mesh was setting up... (my network still looks meshy but I would say quite a few more devices are connecting directly to the C8 than the C7, likely due to stronger signal?).
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Also, I would reboot my C7 every night - rebooting the hub never fixed the sensors when they stopped reporting. On the hub they would show as online, but no events being reported. I tried a bunch of different things and in the end the only thing that ever worked for me was power cycling the sensors.
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That's good news so far, but I've had them seem fine for >2 months and then fall off, so you may still be inside your "grace period." I hope you do end up w/them behaving well, but I think you'll need to go at least a couple months to start getting confident they are solid. But good news so far, which is nice.
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