I was wondering if anyone else was in my position. I am on a C8Pro and am using a zrts1 to control my somfy blinds. I noticed yesterday they were not responding to the My Position command. Eventually I reset from 2.4.2 to 2.3.9 and everything worked fine. I upgraded again today and my blinds stopped working. Reset to 2.3.9 and everything works again
Are they Zwave or Zigbee?
If Zwave, are you using Zwave JS on the 2.4.2 platform? Rolling back to 2.3.9 would go back to legacy ZIP since it does not have Zwave JS gateway available.
Well I was using Zwave JS on 2.4.2. I went back to legacy and the shades work! Why would that be a problem. I am not an expert in this stuff
Because they made changes to Zwave JS on 2.4.2 which fixed a few things and broke a whole host of other things. IMO Zwave JS is still in beta phase. 
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The ZRTSI and ZRTSII devices are series 200/300. Very old for Z-Wave, and the devices themselves are also a bit flakey. Later series controllers (700/800 series), have issues communicating reliably with them. The current Z-Wave JS implementation on Hubitat is particularly unreliable when communicating with Somfy. The legacy Z/IP version works most of the time, but even then some RTS devices need commands to be repeated for reliability.
The need to repeat commands creates havoc with My Position because the My Position radio command is the same as the Stop radio command. The first command starts the unit moving to the saved position, the second command stops it, the third starts it again, etc. This is why, if you do use command repeats, it's always best to use an odd number.
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There are two other options. Both involve switching to the Somfy myLink WiFi hub.
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Spin up a Home Assistant instance, use the Somfy integration, bring things over to Hubitat using HADB.
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Use the Hubitat (community contributed) myLink integration. It's a bit rough to set up, but it works fine.
Have you done this? If so, what Z-Wave stick are you using with HA? And does it work reliably with ZRTSII?
[Edit: Never mind, my mistake. I read right past the "switching to the Somfy myLink WiFI hub" part.]
