CX9200 keeps going online and offline. Problem is progressively getting worse
Corrosion buildup on the connect between the main board and power supply
Remove and reseat the main board on the power supply
Replace board and power supply with ones that have the Gold plated connectors
In some cases the power may be slightly low 4.6V or lower so that the board isn't working correctly when the battery is low. Adding an external UPS can help.