Good afternoon, lately my internet connection started being really slow so I thought it could be caused by a malware, then I decided to install and run Malwarebytes on my PC since Windows Defender didn't help me at all. This problem only occurs temporally, then my connection works normally for a few hours, so I don't think it's about hardware.
Malwarebytes found many threats which I've already deleted, but I'll post its scan log anyway. It solved an issue that made the Google website be slow, but my internet is still failing a lot. Of course, I've been talking to my internet provider company, but they found no issues, and my speed should be 300 Mb/s as it's shown by the speed tests but it's clearly not. Furthermore this is not happening to any other devices connected via Wi-Fi.
At this point I'm totally lost, so I'd be grateful if you could help me. Thank you very much.
(FRST, Addition and Malwarebytes logs are attached)