Ok, first of all DELETE the AFN_EMU reader from your config. It is absolutely useless. Then follow the steps below, so I can see what is the problems with the descramblers number.
0. Delete AFN_EMU reader
1. In webif --> Global enable logging and set initial debug level to 128. Also set file size to 1000KB or even double or triple this size.
2. Tune to one crypted channel (which uses tandberg or card sharing - but not powervu).
3. Restart oscam-emu.
4. Zap to another channel like above (that uses tandberg or card sharing - but not powervu).
5. Then zap to a powervu channel (make sure you already have the correct ecm keys, so it opens).
6. Zap to a different powervu channel (again make sure you have correct keys).
7. Zap back to another NON-powervu channel.
8. Then put receiver on standby mode.
9. Finally, turn on receiver again (to the last channel).
Please follow the above steps exactly so I can see if the descrambler count is correctly determined every time. You can stay in each channel for 10-20 seconds (I don't mind). After completing the test, I would like to get the log, of course. If there is a .prev file in the directory where the log is, I need that also.
You can also try to reproduce the "freeze" again (after deleting AFN_EMU reader). To get a better formatted log in putty, perhaps maximizing the putty window will help. Or maybe there is also a crash.log (or enigma2.log) in /tmp folder?