I was having problems getting my 4G to remain connected. The status would change to Disconnected immediately after making a connection. I check almost everything. RSA Keys were fine. I thought it may have been the
android-wifi-tether install so I removed it. Still no 4G. Just as I was about to turn in @ 3am, I realized the WIFI was enabled. After shutting that down - low and behold - 4G immediately connected. So glad I didn't go through the trouble of unrooting.