Installed a Vista 20P about 10 years ago. Other than battery changes it's been great.
About three weeks ago my front and back door sensors regularly don't show closed and I cannot set the alarm without bypassing them. In between that I get RF Supervision errors via text/email (and generally at 3AM from the keypad).
I replaced both batteries last weekend but still running into it.
Do sensors go bad? Not having similar issues with the other 10 sensors.