One mocopi sensor keeps disconnecting

I just received my mocopi today and one random sensor (it changes) will disconnect after a few min of tracking and cause the tracking to no longer work unless I reconnect again and calibrate. How can I fix this.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0