Our B315 modem has been playing up recent after working perfectly for about 2 years. It seems to switch itself every couple of hours between band 3 1770 MHz and band 28 730.5 MHz. On band 3 the signal strength is not good and the rsrp is about -110dB, everything grinds to a halt. On band 28 the rsrp is around -80dB and everything is good.
It has an external antenna that was also used on our earlier 3G moden from Vodafone.
Has something changed with Vodafone around the Feilding/Kimbolton area or is it likely our modem is faulty? Luckily our old 3G modem works fine as does the Skinny B618 modem with no external antenna.