Extreme FPS drop when receiving SE-Mail

After 4.1 hit and due to the updated veteran rewards, I've been getting mail containing those veteran rewards.

HOWEVER:

When I Do receive these mails my ingame FPS drops to somewhere between 0-1 forcing me to exit the game completely and log back in. The only reason I suspect it has to do with mail is that I keep a clean mail box and everytime I manage to log back in again it has SE-mail (containing said veteran rewards). Had a player send me a mail and didn't affect my FPS at all. It happened twice (1 for the strife gear and 1 for the tantalus gear) and both times it bogged up to the point the game became unplayable...

Anyone any clue ?