This is with one Pi running a Pi Hole and Unifi Controller and another running Home Assistant OS with a Home Assistant setup which is now fairly complex...
Storage could also be an issue, I've got a gold A++++ or whatever rated micro SD card in the Pi Hole / controller but a NVME SSD for my Hassio setup (which did corrupt once when I was using an El cheapo micro SD but has been all good since).
To say I'm no expert on this shit is an understatement but as I understand it stability issues are normally power or storage presuming everything is installed correctly.
At the risk of teaching grandmother to suck eggs, what are you powering them with?
I've got one of these that was recommended on here and zero stability problems:
https://www.amazon.co.uk/dp/B00YSA0WI8/ref=cm_sw_r_apan_glt_fabc_8VFZ7RRFVWND8MH9TM3K
This is with one Pi running a Pi Hole and Unifi Controller and another running Home Assistant OS with a Home Assistant setup which is now fairly complex...
Storage could also be an issue, I've got a gold A++++ or whatever rated micro SD card in the Pi Hole / controller but a NVME SSD for my Hassio setup (which did corrupt once when I was using an El cheapo micro SD but has been all good since).
To say I'm no expert on this shit is an understatement but as I understand it stability issues are normally power or storage presuming everything is installed correctly.