RND and I were getting that as well as connect issues with voice calling. I rolled back to version 10 an the desktop and version 9 on the lappy (9 has no video calling). You can get older versions from filehippo, HERE. I saw no significant changes in version 11 that justified using it.
Personally, I'd like it if WB skinned Messenger completely. I've used it since Messenger8 and the included skins are very lacking.