One phone just stopped working

both batterys work, I switched them around,the phone that does not work is sitting on the base with the charge light on the screen also says "handset 1" and the battery sign is showing both batterys work, I switched them around,the phone that does not work is sitting on the base with the charge light on the screen also says "handset 1" and the battery sign is showing

Handset one stops working. If I try to get a dial tone, it beeps at me twice and then goes back to screen it has when it is hung up. In the past, establishing a dial tone on handset two has fixed handset one. Sometimes I realize this is happening because I hear Handset two ringing, but not handset one. Lately, both handsets have been having the same problem,leaving me without a phone connection for unknown amounts of time. This is very frightening. We're fortunate it hasn't happened during an emergency. A few times, I have noticed I have a voicemail, but the phone never rang, and the caller ID doesn't show the call. My phone was purchased new at Target and is less than six months old. This service is not acceptable. Handset one stops working. If I try to get a dial tone, it beeps at me twice and then goes back to screen it has when it is hung up. In the past, establishing a dial tone on handset two has fixed handset one. Sometimes I realize this is happening because I hear Handset two ringing, but not handset one. Lately, both handsets have been having the same problem,leaving me without a phone connection for unknown amounts of time. This is very frightening. We're fortunate it hasn't happened during an emergency. A few times, I have noticed I have a voicemail, but the phone never rang, and the caller ID doesn't show the call. My phone was purchased new at Target and is less than six months old. This service is not acceptable.