Welcome to the forum!
Another member had the exact same issue, but it first started intermittently happening then it became permanent. The module failure will mean that internally there has been something that failed within the radio itself, likely a bad connection. It's not an antenna issue because when I disconnected mine, it still showed numbers and tried to find a signal, then it said "check antenna connection".
You're only choices are try fix it by taking it apart and looking for a bad connection, have a professional do it, or, buy a different radio.
You could always live with it, unless you must listen to Sirrius radio. Good luck!