Over time, electronic components age. Electrolytic capacitors break down, resistors age, etc. If it wasn't working reliably, then it would be time to repair or ditch. That goes for equipment on any frequency.
We had a problem in Clovis NM with the power company constructing a high voltage transmission line along the edge of the county road that the city owned field abutted against. Those with larger aircraft, like the quarter scale and those with fast flying smaller planes could possibly strike the wires or poles especially during the approach on landing or take off.
We have a new field provided by the city about a half mile from that location, away from any electrical power infrastructure. High voltage electromagnetic interference is no longer a concern at our new location.