when i tried to impersonate (tried login as user)and tried accessing a record which is last used ,

Can you elaborate on what you’re doing a little bit more? 

Hi Stephen when i login into my org as administrator(x) and  try to login as another user(y)  and have gone to a skuid page and open a record(the record accessed last time) in a table  and the y is being logged out of the org.

Hi Stephen when i login into my org as administrator(x) and  try to login as another user(y)  and have gone to a skuid page and open a record(the record accessed last time) in a table  and the y is being logged out of the org.

User Y probably doesn’t have access to something you’re attempting to view.

both x and y are system administrators.this one particulary happens when x logged in as y clicks on a record y actually has last accessed when he logged in.