My FPS on PBE might be bugged? HELP!

Okay, almost 2 weeks ago I got a new gaming PC which is quite strong. I've played on around 240FPS, 160FPS when in a teamfight. 3 or so days ago my FPS randomly dropped and is staying on maximum of 130FPS and keeps spiking till 80 or so when in a team fight. I've checked if my settings changed by any chance, but everything is as I left it. I don't think It's my PC, but now I'm not even sure anymore. Is this normal on PBE or is my PC tripping? I've already reported it to Riot since I think it may be their problem connected to the PBE server.

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