I can confirm I had the exact same issues last night. It was completely unusable in the middle of the night. Even the USA Low bandwidth channels had many that were not working or freezing super bad.
I tried rebooting my modem and router (kids were screaming), also rebooted my box and made no difference. Tried with m3u and with Streaming Line, both with :2086 and without.
Switched to my backup service, and it was working flawlessly. So it was server/remote end related.
Hope things stabilize soon.