Hello viktorw,
I am sorry to hear that you are unable to solve your problems.
But I can also confirm, that there is no problem with the server, for example (as it is running right now):
2015/12/18 19:49:21 17FE610 c dvbapi (098C&000000/0000/0000/0082/98:0035): found (102 ms) by Sky-DE - Discovery HD
2015/12/18 19:49:28 17FE610 c dvbapi (098C&000000/0000/0000/0082/98:D9AB): found (94 ms) by Sky-DE - Discovery HD
2015/12/18 19:49:35 17FE610 c dvbapi (098C&000000/0000/0000/0082/98:A16B): found (111 ms) by Sky-DE - Discovery HD
2015/12/18 19:49:42 17FE610 c dvbapi (098C&000000/0000/0000/0082/98:AE1B): found (134 ms) by Sky-DE - Discovery HD
2015/12/18 19:49:49 17FE610 c dvbapi (098C&000000/0000/0000/0082/98:C7C0): found (110 ms) by Sky-DE - Discovery HD
and believe me, I am also nothing more than a normal user of the server like you
as you said yourself: it worked fine for a year - like for any other user (without problems)
do you see increases of complains since summer (perhaps you might find one or two, but keep in mind that SkyDE switched from Nagra encoding system = response times up to ~5500-6000ms works fine to NSD = 550-600ms time = 10time short, to deliver the required codeword to the receiver)
However, if you priories CAID 1830 for HD+ (MTV-HD, Pro7-HD etc) the response time can still be up to 6000ms - as its not working for your I think the timeouts from your traces show the bad connection to the server and timeout for CS means codeword-loss = freezing
It might be possible that you do not change anything but perhaps your ISP has ? not for you/your contract but by the routing - and it is possible that other cs-servers using other routing by your ISP is not affected by the problem. But I do not know how to contact your provider and complain regarding this "special issue" *g* I would not suggest to show your ISP traces to a cs-server
As you wrote you are not unexperienced:
perhaps try to use a mobile phone connection !
I relocated last year and was missing cable internet for some weeks and I had no problems to use my mobile phone connection (Samsung S4 and Vodafone/D2-network, most times only connected with "G" service - I am not a specialist on mobile phone thing, but if an Android, or at least Samsung shows "G"status for data-connection its the slowest connection possible *g* and CS works fine, also on time critical NDS system, at that time not used by SkyDE but for SkyUK NDS is in use for years and require the same short response from the server like SkyDE now. OK, for SkyUK it might freezes from time to time as NDS is really time critical).
Create a WLan-hotspot on your mobile and connect your receiver this way, it worked fine for me (and my receiver do not even has direct WLan included, I needed to go through an Accesspoint via cable to connect to the mobile phone via WLan).
At the end, if you cannot find a solution on your side/by your settings I do not know a solution than switching ISP or CS-server (especially as you already found one which works fine)