Mysterious phone lag

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2019-08-27 08:42

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Hello ,
i have meizu m5 , updated its firmware to Flyme 6.3.1.0G and used it for about 11 months with no problems
3 days ago , i noticed a very annoying lag in opening apps and sliding the screen
i removed some apps and cleared ram but lag still exists
i made a factory reset but the problem still exists
i even downgraded to the firmware that the phone came with "Flyme 5.2.10.3G" the phone became fast for few hours then the lag returned again !
please help