Have been using the forums for quite some time, but never had an issue to post. Hopefully I've researched enough and haven't missed an older post pertaining to my same issue.
Anyway, I've had my Droid X rooted for quite a while now, and have had this same problem for about as long. My main reason for rooting was for the free wireless tethering option. It does work pretty well, but I always have a problem: I'll start the tethering, and will be using it fine. After some amount of time (it varies), the traffic indicator will jump from whatever number it was currently downloading at to 0 and pages will stop loading. Usually, I will have to restart the tethering to get pages to continue loading. It's not a devastating problem, but it does become a nuisance.
I have used two different tethering apps (Wireless Tether and Barnacle Wifi Tether) and have experienced the same problem with both.
I wonder if another app is interfering with the tethering option. If anybody knows of a potential conflict with other apps, please let me know! If this doesn't sound like the problem, any other suggestions are most welcome!