though you are not giving much information I have same issue here is my problem.
My lag outs are quite strange, I can see everything going on and everyone can see me, I don't have the average lag I can read chat they can read mine, I don't lag or warp and my connection is solid. Then every once in awhile I can see my lag bar rasing and rasing till bam time out.
It doesn't matter if im directly connected or not, I can download things at 400kbs (my connection is 5mbs.) Other games I don't have this issue and my ports are open. I am using vista and never had this issue on xp yet have tried every fix possible. I am currently running off a fresh system as I just reformatted. here are my specs so its not my pc.
Intel(R) Core(TM) 2 quad CPU @2.4GHZ, 2gigs of ram, vista 32 bit.
I have tried several things so far such as disabling remote differntial tuning (or whatever its called.) Disabled my autotuning, made autotuning high (which seemed to work for a day. or so I thought.) my pc is only running one firewall windows which exceptions to live for speed, Virus and spyware clean, have used different ISP's and problem is only with this pc I don't know what to tell you
any help is appreciated although I most likly have tried what ever you have suggested. It has been an issue for 6 months and I have ben googling for that long so PLEASE help.