I started getting this problem about an hour ago. Bot was running normal, then just stopped in the middle of the rift and "Patiently waiting for the Navigation Server" and "Could not connect to the server!" started spamming.
I have checked now and it looks like this problem self-resolved. I don't know what was that. Nothing was changed on my pc for last 2 weeks. Firewall/antivirus were disabled. It was down for 3 hours while I was trying to fix it. Now it works.
Sry for disturbing and thx for response.