We are running into issues where regions are going in to transition continuously.
Because of this we are having uneven distribution of regions across regions server.
logs for Hbase master :- https://pastebin.com/mUMzV6vZ
Attached is the screenshot for the same.
That log reads like your phoenix install is really messed up, and also that the master can't reach a few of the region servers. Are they perhaps crashing frequently?
I would encourage you to address the "missing jar" errors in your logs first. While they're probably not the cause, it would at least help remove unconnected errors.