Guys i have a Nexus 5 that dropped into the water. Took it out quickly and dried it. Worked fine for about 2 months. Then GSM Network couldn't be detected and battery cant charge more than 20%. Any suggestions what could be wrong and where would be a good place to fix it?

I have flashed the phone to Lolipop and its lovely to use. Only cant use the GSM and the battery issue.