Skype was working fine for months and all of a sudden, it does not anymore. After talking for about 20 minutes, both audio and video quality drop dramatically, then the call gets disconnected. After that, I can't even click on the green phone symbol to accept a new call. It always says "internet connection problem" but I have checked the connection and talked to my internet provider, and it is perfectly fine. Another strange thing is that I only have this problem with one person (their connection is fine, and they don't get the "internet connection problem" message).
Any ideas on how to fix this? Thanks a lot.