Is ((forgetfulness) incompatible with the memory activities?

NO, they are more than compatible

Are there involuntary nerve signals to temporarily stop the memory?

Undoubtedly and subconscious and conscious ones too.

For a good summary on all of Memory see: Memory by Baddeley, Eysenck and Anderson SECOND EDITION (2015).

Is ((forgetfulness) incompatible with the memory activities ?

No, but the degree of discomfort that generates is not the same for a young adult tan for an old person.

Are there involuntary nerve signals to temporarily stop the memory?

Surely, it is well known that anxiety or depression interfere with memory processing in the absence brain organic pathology