What is the best mouse and keyboard sharing software?

Sorry to hear that you're having problems. Sounds like you're having a problem that was fixed in Synergy 2. Updating to the latest version of Synergy 2 should solve these issues. If not, would you mind contacting customer support? https://symless.com/contact/customer-support

Hey, there's a con that talks about this restarting issue. I'm going to flag this one as a duplicate. Sorry!

That's odd... what version are you using? I've only ever had to install a new version to get my Pi to connect.