I have upgraded my Raspberry PI from jessie to stretch today.
Everything went - more or less - well.

Kaffeine was upgraded to Version 2.0.5-1.

This seems to make a huge problem.
I have configured DVB-S(2) with a DiseQ Switch as follows :
A = Astra 19,2 East
B = Hotbird 13 East
C = Astra 23,5 East
D = Astra 28,2 East

Everything works as expected (Satellites B,C,D are fine), but A (Astra
19,2) Degrees East seems to be never selected.
When I want to search for the Channels with the default scanfile.dvb it
stops after a few seconds.

Then i have modified the scanfile.dvb to include some other frequencies
to search for.
The result was, that on "Astra 19,2" i found a lot of channels, that are
for sure not on that satellite.
(I guess, they were from Hotbird 13)

After that I have downgraded Kaffeine this way :
  apt policy kaffeine
  apt install kaffeine=1.2.2-3+b2
  apt-mark hold kaffeine
(Still had the repositories for Jessie activated)

With the old version all 4 Satellites can be viewed again.


USB Reciever :
Bus 001 Device 006: ID 0572:6831 Conexant Systems (Rockwell), Inc.
DVBSky S960 DVB-S2 tuner

Kernel :
4.9.35-v7+

I dont know exactly, if this is the correct place for this bug report.
(raspbian = debian, does it ?!?)
But for me it is obvious, that the problem will be there in "real"
debian stretch too.
If I am wrong here, pls. tell me.

Br