Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Major Problem

Even with freshly charged batteries, all of the handsets drop my calls without warning after about 30 minutes of conversation. Sometimes, the person I am talking to will tell me I am "breaking up" shortly before the call gets dropped. This problem occurs regularly, regarless of whether I am sitting immediately next to the base or not. I have been unable to resolve this problem on the phone with Panasonic service, so now I have to send them all in for repair. A major bummer!