I had the same problem. Personally i was just playing too much and after short break i can play "normally" now. 1300 after 4 months of playing is great achievement so maybe you're just kinda tired with chess?
Tips for Tilt and Focus during Chess?
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So like 5 days ago, I was 1370, my rating dropped down to 1300 mainly because of one move blunders in an endgame where i was completely winning, i usually lose focus and concentration and then make stupid moves and get super tilted and play way more games than i should. I started playing chess like 4 months ago and this has been a huge issue, let me know if anyone successfully dealt with it.