My phone started to have charging problems for the past week. I plug it in the OEM charger and 2 hours later it didn't charge much, sometimes it even lost some charge. I kept a close eye on it and noticed that sometimes when I plug it in it shows USB charge, sometimes AC charge, sometimes it starts with one and changes to the other randomly in the middle of the charging process. I suspect the charger is the culprit but I'm not 100% sure. Did anybody here experienced similar issues?