Currently using a non enterprise account. Been utilizing a file that is shared with me, but periodically file goes missing with “Oops! We can't seem to find the page you're looking for.” The parties i am collaborating with have not changed anything but we want to continue access with file. We constantly lose access after a couple month. 

No changes have been made on file and location. is there a way to grant access to file further than a couple months? 

Please assist.