Well I have the same problem, pops up every couple of weeks and goes away in a couple of hours to a couple of days. I'm not the only one, I know 5/6 others people in the 77y that get this problem regularly, including Aztir (our Col and head of the 77y). People think it's just random bad luck with their ISP's, having conflicting programmes or other people using the same connection in the house doing stuff, and it might be, but considering 3 of the people have the problem most often in the 77y, usually on the same days (not always though, which makes it even more confusing) live in the UK, Portugal and Norway, I doubt it's a problem with a specific ISP.
Also worth note is that I've done tons of different checks and if it is a problem with it conflicting with another programme running in the background I have no idea what that programme is since I've tried turning off everything possible while having the problem and it makes next to no difference.
I've also had the problem when I've been the only person in my house and presumably the only person using my connection (I have checked and I'm certainly the only visible person).
This is also a problem that only happens with M&B Warband (I also get bad ping on servers running different modules). I get 100% to 500% increases in usual latency across approximately 80% of the available servers (but some of the servers display no change and play just fine, even when they are populated) while on other games my ping is fine across all of the servers I usually play on (checked TF2, CS:Go and NS2) and this has only been something that's cropped up in the past 2/3 months, and has been getting increasingly more common in terms of frequency and the number of people it seems to effect.
So yea, it is a problem and it doesn't seem to be going away or as of yet have any known fixes or clear reasoning behind it.
