I have a service bulletin for the XTS series about a similar problem. It was caused by contamination on the battery contacts of the battery and the radio.
An excerpt from the SRB.
SYMPTOM:
Radios with a build up of contamination in the radio/battery contact interface may experience unexpected radio resets. For display radios, a reset will be accompanied by the display indicating ‘Self Test’ followed by the power-up tone.....
Contamination on battery or radio contacts, such as fibers, dirt or other nonconductive materials may collect and cause intermittent radio/battery connection and power interruption (resets). This contamination can also cause accelerated wear to the radio and/or battery’s contact surfaces.
The fix is to use DeoxIT®GOLD from (Radio Shack, McMaster Carr, Fry’s, etc.) or directly from the manufacturer, CAIG Labs, at
caig.com - Home of DeoxIT - CAIG Laboratories, Inc..
The pen-based package is recommended as it provides better access to the recessed contacts of the battery. The pen’s tip will most likely need to be modified (trimmed on the sides) to improve penetration into the battery contact slots.
Per the manufacturer’s instructions, shake the pen and depress the tip until the fluid saturates the tip. Apply to each contact surface (radio AND battery sides). IMPORTANT - Extra care should be taken to ensure adequate lubricating of the larger contact surface area of the battery contacts. After cleaning, inspect both contact surfaces for signs of advanced wear. Advanced contact wear is defined as wear through either the radio OR the battery’s contact platings (gold and nickel) to the base metal (copper). Copper exposure is characterized by a distinctive orange-brown metal appearance surrounded by the silvery nickel underplate and gold top plating. In some cases, a magnified (8x to 10x) inspection may be required to verify wear into the base material. Polishing of the gold or nickel surface is common and is not considered a need for replacement.
Or you could try a pencil eraser on the radio and battery contacts first and see if this works.
Mike
WB8VLC/7
