I ran into this also, posting this here in case someone has a similar issue. in my case it was an animation blueprint that used an array. anim bps run 100% of the time even when its just the editor and when the game was not running the array was empty so it was constantly spamming error messages in the log saying tried to access index XX from array of length 0. I had a bunch of log files that were like 20 gigs. deleted the log files and fixed the code and that fixed it for me. So, might be worth checking Saved/Logs and make sure you dont have something spamming the log file
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