Since about 2 months, I've started to experience problems (weak/very unstable signal) with my Nexus 4 phone. I tried to turn it off and on, taking the sim card and putting it back on after turning off my phone (it helped for about a minute before acting up again). I even tried a hard reset of the phone itself after I backed up my datas on my computer... I'm pretty desperate right now... Thanks in advance for the help!