Helping Hoof.

Hi everyone. I need a little assistance from anybody here who uses skype and knows it's ins and outs. Recently I had an issue where it said I was already sign in and couldn't get back in, so I googled how to fix it. I did what the person suggested and it worked, however, it deleted all of my chat history with my friends. I lost all of my messages and all of the work on Roleplays we were doing together. I managed to get over it with help from my friends and decided to continue on. But today I found out that Skype now deletes my messages after I believe every 2 days. I wanted to know if anyone knows how to stop that from happening. If you do, a PM, comment on my profile, or if you do a reply here then I will appreciate it greatly.