The Manual describes it as a FULL reset (see below).
You can use the software to save your current details to the SD Card before the FULL reset.
11-5-1 SYSTEM RESET
Performing System Reset will return it to the original factory default settings.
However, all search banks, search groups, memory channels, memory banks, scan groups and memory
contents will not be deleted.
To perform System Reset, perform the following steps:
1. Turn the receiver off.
2. While holding the [CLR] key, push and hold the volume knob until [Sys.Reset] is displayed on the LCD.
11-5-2 FULL RESET
Performing Full Reset will return it to the original factory default settings. All personal settings will be lost.
To perform Full Reset, perform the following steps:
1. Turn the receiver off.
2. While holding the [CLR] key, push and hold the volume and squelch knobs until [FullReset] is displayed
on the LCD.
Always worth a try, but it looks like a hardware fault, sorry to say.
Good Luck