Emails only sync sporadically, cant open pdf files from emails that finally do sync

[AC Question]

Samsung galaxy Tab A, always worked before to syn emails and open pdf files in emails, now seldom works, syncs emails sporadically. What is wrong?

 

[B. Diddy]

Welcome to Android Central! I assume this is with the stock Email app, correct? Which email provider? Have you tried removing that email account, then adding it back again?