Wonder what you trying to do? to be connected to a wifi, or use is as wifi hotspot source?  Note that you can not turn on your droid x wifi hotspot and connect it to another wifi source at the same time.

If it is just issue connecting to another wifi router, update your droid x to latest firmware so see whether it fixes your problem. The last firmware (340) worked for me.

And of source, you may also need to verify that your router is working well. Trying to connect to your router with different handsets. If it is only your droid X experiencing problem, then it is issue with your droid x, otherwise, could be your router.