This is a big board and we thought we had the .htaccess fine tuned for the forums but it appears not. Seemed when we setup the IPB SE Friendly URLs .htaccess rule with the litespeed .htaccess rule and some visitors started reciecing infinite redirect notices using mobiles and google translator. Upon inspection it appears we failed at the rule rewrite mod for IPB and LS Cache.
Thanks. Sorry the same issue occurs. This looks like what I had before.
I think you need to find out which URL is causing the trouble.
Maybe something should not be cached has been cached. and turn cache off for that URL.
If you can reproduce the problem, you can check it with firebug, or use tcpdump to dump the request/response related at network level.