Nauticam vacuum and leak - constant red LED (not battery)

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Looking for some possible advice.
Ive got a fairly new (Feb 2018) housing with the fitted vacuum and leak detector. This worked perfectly for a few months but now i've got an issue.

Basically, when i turn on the housing i get a blue flashing LED then it goes to constant red and stays there.
According to the manual this is low battery but ive now tried 4 x 2450 batteries with the same result so the chances of a bad batch are likely remote.
If i fiddle with it enough (remove, reinsert battery, turn it on/off, push, squeeze etc) for a few minutes then usually i can get it to behave itself and it works, shows vacuum and stays working normally until i next turn it off.

Im confident there is no loss of vacuum or moisture (contacts are clean on the detector probe). The red comes in before even fitting the back.

Any idea what i can do to troubleshoot or attempt to fix this issue as obviously having a known vacuum and working leak detection would be nice.

[Stuart Keasley]

Have you tried giving the battery contacts a good clean?

[Tim Digger]

Have you tried giving the battery contacts a good clean?

Or is there an iffy connection from battery holder/contacts to the electronics including partial short circuit.

[Pete Bullen]

Or ask Mr T

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Im not seeing any obvious corrosion or bad contacts but it does work after fiddling. I guess the next step is to remove the detector from the bulkhead and check it properly.

[steelemonkey]

Is it not still under warranty?

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Is it not still under warranty?

It is but as the season has started so im on the boat every day its not really practical to take a trip off, book flights and get it to the nearest dealer to look at. (and for the same reason i cant just send it away for a few weeks)