mobile

my moto g2 was running well when it was updated to lollipop 5.0.2. After around 2 months it fell into water for around 2-3 seconds. i took it out suddenly and switched it off because there was no option to take battery out. after 5 to 6 minutes it turned on automatically and i could see water bubbles in the screen. i tried to switch off but touch was not functioning at the moment. at last i could do it. again after certain time it restarted automatically there was a ususual vibration sound and a white display. i couldn't do any thing because battery was inbuilt and it was not functioning. i left it whole night until its battery was drained completely. I dried my phone on the sun, kept it inside bucket of rice. After 2 days i charged it and started phone was running well and i could see little water bubbles in the screen. then i noticed that when i lock the screen or after automatic screen off if i unlock the phone phone was starting up. it means after screen off phone sleeps and it shuts down or some time restart. At first i thought it would solve if i do hard reset then i did factory reset it didn't work. i unlocked bootlader rooted phone and flashed cyanogenmod 12.1. but there was same problem. then i restored back to stock android 5.0.2 there was same problem.
Now i am using my phone by running music player in the background and making the volume 0. while playing music if screen is off it won't shutdown or restart. and also while my phone is in charge it won't restart or shutdown. So to use my phone either i have put it on charge or i have to play music in background.
How can i solve this problem? Please help