Is it possible to use pgx1 and pgx2 simultaneously with one receiver?

There are many reasons this could be happening. Call Shure Tech Support at 847-600-8440. They can help you troubleshoot. Have the mic nearby when you call them.

If the mic will not stay powered on, then it will need to be sent to Shure for repairs. www.shure.com/service

Give Shure Tech Support a call at 800-516-2525. They can help you troubleshoot. Have the wireless system nearby when you call them. They are very good.

If it won't turn on, it will need to be sent to Shure for repair. www.shure.com/service

The PGX2 should get about 8 hours with an Energizer or Duracell battery. If yours does not, send it to Shure for repairs.

Make certain the new mic is in the same frequency range as the old receiver.

Unfortunately, it is nearly impossible to troubleshoot this over email. I suggest calling Shure at 800-516-2525. They can help you trouble shoot the problem. Make certain you have the wireless system with you when you call them.

The mic is probably in a different frequency band than the receiver. Look at the stickers on the receiver and the mic to make certain they operate in the same frequency range.

I assume you mean that there is not enough range in the wireless system. That is, you can't get far enough from the receiver. Try scanning for a clean channel, using the instructions in the user guide. Also make certain the receiver is up in the open and visible from where you are using the mic.

It is definitely a Sync issue.

1) Make certain the microphone is ON and the light on it is green.
2) Remove the battery cover from the microphone.
3) point the **** end of the microphone (where it says Sync) toward the Sync button the receiver (about 6-8 inches away).
4) Press the Sync button on the receiver. You should notice the light on the microphone flash.

If this still does not work, call Shure Applications at 847-600-8440.