Thank you for participating in the Slingbox community forum. I see you're having several problems with your Slingbox M2. I will be sending you helpful information, due to you having several problems with your Slingbox M2. Althought, it would be best if you would do a hard reset that will help you fix both problems.
See the link below.
No audio coming from your Slingbox stream? Here are some basic troubleshooting steps to take.
IR Emitter/Remote Control Troubleshooting for Slingbox M1/M2
How to reset your Slingbox
Sling Media Support