Hi,
all my Tevii DVB Cards (S482 and S471) have the same issue after updating my x86_64 HTPC from LE9 to LE10.
I think it's some Kernel or driver Issue but I'm not able to excacly bisect where the Problem is... 
The cards work fine for some time but after some minutes or hours they do weird things.
Watching the same channel works but changing channel does not. It just wont tune to it anymore and keeps failing and i need to reboot..
Tvheadend produces this output all the time:
Apr 13 21:00:02 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:10 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:10 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:17 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:18 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:25 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:25 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:33 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:33 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:40 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:40 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Apr 13 21:00:48 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - poll TIMEOUT
Apr 13 21:00:49 LibreELEC tvheadend[415]: linuxdvb: Montage Technology DS3000 #1 : DVB-S #0 - retune nodata
Btw: nothing is logged in dmesg at this time.. just the normal initialization.
As i said above it happens with every tevii card using the ds3000 driver, and it also happens on plain (not libreelec) linux systems with latest kernel and drivers.
So i think it's a kernel or driver regression. Can someone help me to get this back working?
Setup:
LE10 Beta 1
tvheadend 4.3
ds3000
dvb_usb_dw2102
