Try increasing dashboard refresh intervals from 2 seconds (default) to 5 seconds.
I'll be taking another look at dashboard code for 2.2.5. It used to be a real resource hog, and things got better, but it looks like there's still room for improvement.
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Do dashboards that are not currently displayed on a device consume hub resources?
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No, only whatever shows up in browser, mobile app, etc.
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Any update on getting to the root cause and fix to stop Hub from not responding? This weekend I was away and had HSM activated. When we came home last night first clue something was wrong was our entry door did not automatically unlock. Then when we entered the motion detectors did not turn on lights like they are supposed followed by no notification from Alexa that alarm had been activated and needed to be deactivated before siren goes off. When I attempted to check the hub I hit the same situation as others where I got no response. I unplugged hub and when it restarted lights then came on and HSM sent appropriate a alert to Alexa and my phone that alarm had been activated and siren would activate in 20 seconds unless disarmed. I find I have to restart my hub about every 10 days as this freeze issue keeps occurring. I will try implementing the community hub rebooter app but that really does not solve the problem if hub freezes in the middle of the day and HSM is Activate I would have no way of knowing if someone broke into my house or not. I hope the good folks at Hubitat will be able to fix this freeze issue within the hub itself.
Did you ever fix this? I'm running into the same issue
That is not very helpful to diagnosing the root cause. Could you please describe what is happening, and when? Any particular pattern to this, or when a certain device or app is used? Have you tried disabling anything to see if helps?
What firmware version is your hub? Did you try an older firmware? Did you try to do a backup to your computer, do a SOFT reset, and restore that backup file?
And last, did you file a support case by emailing support@hubitat.com?
No the root cause has not been determined or fixed but since using the hub rebooter app to restart my device every 3 days I have not had any problems with hub freezing. I'm on a Hubitat Elevation® Platform Version 2.2.5.131 using Hardware Version Rev C-4
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I was responding to @gomce62.web asking if they had any updates. I have several tickets that I have opened but the delay in responding isn't ideal.
I just turned that on as well. Again I'm in the same boat but I'm glad it is working for you. My hub froze the last 3 days and I noticed none of my lights were working specifically at sunrise and sundown. When I logged into the webui it wouldn't load. Power cycle fixes it but no logs or system warnings that indicate there was an issue.
Your symptoms sound exactly the same as mine and I also saw nothing in the logs after power cycle that reported any issues. Good news is since installing hub rebooter app I have not experienced any issues.
Glad you got it working. I have to put a smart plug and schedule power cycles multiple times a day 
