To add to
@kev-w battery comments for
@Japes, it may have just been the batteries struggling with the cold.
Sometimes, this manifests as temporary low battery.
Or, like my meter, it just tells me I have an error with my test strips and I waste 4 or 5 before I get home and read the manual ... all whilst having a hypo. At least I think so but the meter wasn't working so I couldn't confirm. But I took some GlucoTabs just in case.
That happened last winter and I try to keep my meter warmer when I go out on a cold day now. I just wish women's coats had sensible things like inside pockets - handbags are not always the answer for carrying things.
I'm on a roll today - woke at 5.3 and plan to stick around that level. I have removed the box of Nakd bars from my desk so I will not be tempted.