What he said 
so I’ve downgraded to to the RPi4 2GB model. I’m going to use the 4GB for MotionEye (CCTV) or maybe Plex server or new mysql server when msata hat is available.
With my existing settings I am using only 900M of RAM (as per htop) so no real need for 4GB.
Thus far, with the RPi 4, I’ve not seen anything wrong that I did not have before on the 3. Still “unstable” with my cron issues.
HabPanel is a bit quicker but still too sluggish to “show off”. This is, I think, not due to the RPi but rather the way it updates. There is another thread (which I now cannot find) where they discussing how to update only the items actually displayed and not all the items. HPV also crashes weekly and requires a restart.
So, RPi4 - good (with heatsink). It does not create new issues for you.