it keeps turning on and off
why is my phone turning on and off after getting wet
iPhone X, iOS 14
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Most likely some internal components have been affected by water but we, just users like you, cannot diagnose that kind of issue remotely, sorry.
I suggest that you make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector
After checking it out, they'll give you all the available options.
Regards
Giulio