T38G pickup handset doesn't answer the incoming call

[hernexto]

Hi,

1.- The phone operator says hasn't happened anymore for several days, it occurred only 2+2 times on two separate days (I though it happen more often...)
2.- Firmware Version 38.70.0.125 Hardware Version 21.4.5.160.64.0.0
3.- Usage: Phone has 11 months, never happened before, phone manages 150-200 calls on working days.
4.- I bought it (among 20x T32G more) from a local small distributor called DENOVETEL (in spain) no clue who is their supplier. In case it helps for tracking, s/n is: 1106312123400494

Thanks,