Sensation with Elegancia : Reboot in foreign countries

[anauff]

Hello,

I have an htc sensation with elegancia ROM sense 4.1 v3.8.0 working with a French sim SFR

I find out that when I’m in a foreign country (like Italy), almost each time I receive a call the phone is rebooting. This happened after few ringing or just after the call.

I France I already get some reboot but very few.

Did someone experienced the same ? is it a known problem ?

Thanks for your help