Lenovo Vibe P1m lagging

I've had Lenovo Vibe (P1ma40) for more than 2 years, the screen is bit cracked but otherwise it's in a good condition. Yesterday it suddenly started lagging - basically it lags every few seconds and after a second or two starts working again. At the same time most of the apps using internet (like Youtube, Gmail and even Google Play) stopped working. I can open them but they just get stuck on the loading screen. Some other apps like Messenger or spotify work fine tho (but they still lag)....

Lenovo Vibe P1m lagging

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