[nings]

PVR was designed to work in a LAN, not WAN. For streaming over a WAN PVR addons should implement appropriate protocols like HLS or DASH. Addons also have the chance to implement their own buffering.

The problem is the same from WAN/LAN or whatever, no buffering so each problem on the link or I/O storage can cause a freeze or cut the stream. This problem isn't present with older Kodi version so introduced with the new version and with the removed/modified parameters for unknown reason.
I think Kodi should solve this issue and not all addons one by one. Buffering is a main feature of any player like VLC who has buffering what ever the source.