So, my gf has a Samsung S III with stock Samsung ROM, and we're having a hard time in synching contacs with gMail.

This is what happens.

1. She had a Nokia. Exported all her contacts in a .csv file on her PC
2. .CSV file was uploaded on her GMail account - which already contained some other contacts -, successfully.
3. All contacts in GMail synched on the S3 successfully, all fields included.
4. On the S3, she added her Facebook, Linkedin, G+, Twitter accounts.
5. She started to "merge" accounts on her S3, as obviously many users have accounts on several social networks. All seemed fine.

At some point, for some reason, people accounts get disconnected, specifically the GMail account of a specific contact gets split from all the others for that contact (Twitter, G+, Facebook, etc.), which stay connected.
In addition, what is really bad, this affected contact's phone number is just gone.

This happened several times, on several contacts, in the very same way, so there is a clear pattern.

Of course, she re-merged the contacts sevreral times, addeed phone # back, each time, but this happens again.

In gMail, on the web, there's a contacts "subfolder" (tag-based, actually), called "imported on ...." and a date of when the orginal .CSV import occurred. It is possible (but it may be just coincidence) that the above problem occurs only with contacts tagged as "imported on...", so she is now removing this tag.

Do u have any idea what is causing this? Especially losing somebody's phone nr is very, very annoying.