GL table error posting

We are using NAV 6.0 with 25 users. Approximately 5-6 times per day we get an error GL table in use or locked by another user error when posting. We are a manufacturer so we are processing work orders and of course sales orders all day. We have automatic cost turned on. My question is if I turn this off and run it every night will this eliminate the errors?

Auto cost posting Yes

Expected yes

Auto cost adj yes

Average cost calc. Type Item

Average cost period Day