Comcast Phone Issues

We switched our desk phone over to Comcast from Verizon to eliminate a monthly expense and also decrease our Comcast bill overall by bundling all of the services - internet, tv, phone. I suppose it was a good idea, but because the phone isn’t a land line, it doesn’t work as well. We primarily need to use the device as a door bell, but it was good in the event the internet was down and cell phones were ineffective. However, over the last month, every time we get or make a phone call using this phone line, it is dropped after about five minutes. This gets quite annoying. So I finally decided to call Comcast and report our issue. I already checked the phone status using my app. To make a long story short and after two modem reboots and an hour and a half later, the phone at least rings - it stopped ringing midway through. But now the app that also rings when the phone dies stopped working even after deleting and reinstalling it. We don’t really know if the calls still drop because we haven’t received any, although at one point my husband was trying to test it by holding one phone in each ear and talking to himself. But that experiment was aborted! The last thing I want is a technician to visit, or have to get new equipment. So as long as I can check on the phone log and see any voice messages I suppose we can live with it. All I know is I hate having to troubleshoot any of this junk because it takes so long. And it’s more annoying when it’s not totally fixed.