Anyone else having troubles with connecting?

Hello, my online experience is broken since the day before yesterday evening. I can't get summoned, nor summon myself, nor invade, nor am i being invaded.
I am using DSCfix 1.1 and updated to 1.2 yesterday, UPnP is on, NAT is open.
Until Two days ago, i had it working fine all the time, connections with my friends were established in mere seconds, i even had some random encounters. But when i turned on my computer to trade some items on sunday evening, everything changed. The guy i wanted to meet saw my sign for a short while, but it kept failing to summon. After that he didn't see it anymore. We were trying for about one and a half hours to no avail. Yesterday evening, same procedure, other guy, saw my sign but it went off and was never be seen again. Did several restarts (game and even system) but nothing helped. I looked into the dscfix.log and recognized minutewise entries saying "connected to..." followed by "disconnected from...".
I don't know what's going on, is my system cursed?
Anyone experiencing similar issues?

I would try reinstalling the DSCFix as that should be the main source of the cooperative issues. Something went wrong there. Without this fix you wouldn't even have that much trouble connecting, but with it, summoning should be just about instant and so should summoning stones.

try making a new character and see if you have the same problem either your character is glitched or something is wrong with one of the scripts

I think this is not an issue to my system by now. I examined the dscfix logfile and found out that the steady connection/diconnection happens only on certain persons. I was able to invade a friends game via Dragon Eye in mere seconds yesterday. Without changing anything. Proves to me that the problem is not on my side of the connection.

Well, we had a fabulous time cooping with my 2 mates, summoning in 10 seconds after sign placement, and suddenly some **** happened, and we started experiencing issues with multiplayer'ing, and finally we were not able to summon anything/anyone.
The next day we aimed to try it hard, and spent 3(!) hours non stop trying to summon each other, and finally, we started seeing each others signs, and in 2 more hours we finally made it to start working back again, summoning within seconds... Some mystery from GFWL...