Just to give an update, my unraid did run fine with no plugins for over 24 hours without webui crashing. I went through and deleted all plg files under boot folder except community apps. Rebooted normally. Then installed just 2 plugins, appdata backup and user scripts. It ran fine again for over 24 hours then I installed Dynamix Cache Dir and after 15-18 hours my unraid started seeing all of these php errors again and by this morning webui was completely crashed had to reboot. I will now be leaving it running without Dynamix Cache Dir and confirm its this plugin causing the issues.