Playbook unable to read random received emails

I have an annoying problem receiving emails on my playbook. It only happens randomly, but the email received is gobbly goop - just a bunch of random letters and numbers in the message. When I look at same email in webmail, it's fine - I can read it. And sometimes I'll receive pdf attachments that can't be opened. They're 1kb in size, but when I look at that same attachment in my webmail it's 5kb or more and can be opened. There's no rhyme or reason to the emails received...some are from Internet provider email, some are from hotmail/Gmail and others are from corporate work accounts.

This issue has been occurring since I bought my playbook over a year ago. I currently have OS 2.1.0.1526.

Anybody else have same problem? Any recommendations or possible fixes?

Any special coding? What is the native language?