Exposure light stopped functioning

As in it wont switch on.

Double press it and both the light and the panel at the back flash once then go dead. If I press and hold it gives me the settings option, But double press does nothing.

Its a mk12 Toro, with 67% charge in it and was working fine yesterday.

Could it be the cold ? As said was out last night, probably -5 or -6 and it worked, and was sitting in the hall with the heating on so not that cold in the house. But no idea.

Anyone experienced this can offer a solution ?.

Ta

Drop exposure a line. Their custom service is excellent.