Tuner no longer available

Windows 10 64 bit
Kodi 16.1
NextPVR 3.8.3

I can’t watch live TV while recording is ongoing (same channel). It will complain tuner no longer available.

Also, watching tv program that’s currently being recorded appears to be problematic for seeking. It gets long delay (5-10 seconds) for a skip-forward, showing buffering on top.

Is there any setting or tweaking required?

Thanks