Reboot required after watching 1 episode or switching channels

Well it is not a Debug log and also only the Kodi log. And it may help if you give some details which file you tried to play.

What I can see in the current file is:
CRenderManager::WaitForBuffer - timeout waiting for buffer
Got MSGQ_ABORT or MSGO_IS_ERROR return true

Which could be either a network issue or a SMB client issue.
Suggest to:

  1. Test your network with iperf3 (see below)
  2. Try setting Settings -> Services -> SMB Client -> Mitigate MTU issues with SMBv2