My experience with my Combo meter is that it gets less reliable at taking strips as its battery gets close to needing renewal, or when its cold (cos batteries work less well then).
It does occasionally do it at other times as well, just to stop me getting complacent about it…but not very often.
(And I got a Roche pump because – that was the only one on offer. And if I wanted a different one, well they dont do them at my clinic. Although it has got better, they’re considering the Omnipod things now as well. And I like the remote. Its very useful when my pump is in my bra…)