During the night sms and calls are blocked

[Guest claudx]

Hi to all, i've installed the s2u2 lockscreen and every thing was going well...but without any reasone 1 month ago all my sms and calls, received during the night, were notified when I started to use the phone for any call or sms disabling the lockscreen....does anyone experienced this problem?is a phone-operator problem (i.e. vodafone, wind in Italy) or a phone problem?

Thanks to all!

Claudio from Italy