Well Paul, why don't you start your own 2.4 issue thread and have some folks trouble shoot it. Most likely your don't have the same problem and having two user issues in one thread causes confusion.
This thread started way back Jan 6th. Then Jan 8th all was well. Then all of a sudden, Jan 28 all is not well and we now have another router in the mix. Surprise! It has the same problem! What are the odds! The odds say User Error.
If we go way back to before "all was well", it was suggested that the OP post his complete network setup, etc. That never happened and still hasn't, so it's really all just a guessing game all over again.