Hello, basically my mr6400 router was working all fine a week ago and now it started having some serious issues, it detected the sim card for a very short time and just doesnt detect it anymore?? i put in a simcard, turn the device on, it flashes the wifi logo for a bit, then just stops and stays lit while none of the other ones light up, ive tried this with 2 sims that previously used to work. if i put the sim in my phone, everything works fine... i hope someone can help me :(