Is the db local or on a network?
What about importing everything into a new blank db and seeing if the problem persists?
I wonder if this could be indicative of some hardware issues/failure?
"Could be the begining of corruption...
http://www.granite.ab.ca/access/corruption/symptoms.htm. I would make a
back-up, make another back-up and then first try importing everything into a
new database. Also, read this article...
http://www.granite.ab.ca/access/corruption/retrievedata.htm. And after all
of that I would finish off with this article...
http://allenbrowne.com/ser-25.html and see if any of those circumstances
apply to you."
Taken from Gina, see: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_access-mso_other/access-2010-error-accessing-file-network/9ae829b3-f7c6-4f7c-b137-188363167aa4