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Mimaki ink carts randomly 'disconnecting'

Forty One

Make signs they said... It'll be fun they said...
I've been running some chipped refillable ink carts on my mimaki jv33 for a long time now, and recently i've lost 1 colour each of the cmyk carts.
instead of running dual colour carts, I'm now down to signles.
And now my remaining yellow cart is randomly disconnecting then reconnecting, or I need to pull it and put it back in again.
I've had new chips put in 6 months ago when the first set of carts stopped working but the printer didnt recognise them at all.

Should I crack open the housing and isoprol the connections, or something different all together?
 
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