[88keyz]

[snip]
I was easily able to install Leia 18.7 using the 'Downloader' app on the Firestick and also easily installed the next-pvr Addon.
Unfortunately whilst live TV seems to stream OK, whenever I try and play TV I have recorded the stream might play a few seconds or buffer and then crash or crash immediately.
[snip]

I concur with the ugreen 1GigE adapter with an OTG cable.  I play 4k UHD content using this adapter.

I'm curious what the content of the TV stream you are attempting.  Anything interlaced (MPEG2, MPEG4) has caused me problems with hardware decoding on the AFTV - i solved my issues with transcoding to remove the interlacing and setting DVD's to software decoding.  I'm not familiar with the PVR stuff at all, but I do have a recollection that a lot of folks had problems with interlaced content from OTA recordings.

Hope this helps. 

Hello there,

i am about to buy this ugreen adapter which has the Asix Chip:

https://www.amazon.de/UGREEN-Gigabit-Net...494&sr=8-3

But i can't find a OTG Cable that is Usb 3.0. all of them are 2.0... Will it make a difference streaming high bitrate content?

Thank you 

It won't make any difference.  The port on the Fire TV Stick 4K is USB 2.0 anyway.