Error: No location id was found for address within range logical addresses (4051-4100)

Hello Everyone, in our lab, we have a 7697A Headpsce thas has been installed for less than two years, and since October it started showing the error  NO LOCATION ID WAS FOUND FOR ADDRESS WITHIN RANGE LOGICAL ADDRESSES (4051-4100) wen we run long secuences. 

What is causing this problem?  What do yo recommend to solve it?

I have screanshots of this error, that I would send you.

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