This has been happening since EE3.5.7. I am currently on 3.5.10. I’ve been hoping the issue would stop, but…it hasn’t.
When I go to open an existing entry, or try to create a new entry, I’ll often get this error message, either when the form has barely loaded the title, or when most of the Publish tab is visible but the rest of the tabs’ content is not available. Sometimes when I reload the form and don’t click away to another tab, I’ll get the full form. Other times I may have to reload 3 or 4 times.
I have 3 3rd-party addons installed: CCB Chopper, DevDemon’s Channel Polls, and Solspace’s Tag. I uninstalled Channel Polls, because installation of that plugin seemed to be close in time to when this error cropped up; but it still takes quite a while for an entry form to load, and I’m still seeing that error message.
Error message (exact path modified for security purposes) Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 2052805 bytes) in /home/myaccountname/public_html/system/ee/EllisLab/ExpressionEngine/Service/View/View.php on line 135