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Thanks for the replies,
and,
please accept my apologies for the tardy reply.The 'problem' showed up on some very misty days, and on a day when some raindrops hit the touchscreen.
I originally thought that maybe some combination of the Circle Case and damp screen was in some way being registered by the touchscreen as an input.
I have now found it is indeed a safety feature,
and,
can be solved by using the physical buttons on the rear of the LG G4 to reduce the volume back down to levels that the device deems safe for earphone use.My LG G4 'lives' in a belt case, so I guess is potentially prone to the physical buttons being activated during use, increasing the requested volume beyond the safe level.
Might be a built in ear saver... My Sony reduces volume after a time and prompts me with a message about volume safety. Thankfully you can switch off in sound prefs.