mobile

i have recently updated the android os of my xperia z2 to lollipop. now i'm encountering some issues when sending sms. there are times the sms won't send even if i have full bar signal and it only shows "sending" on the messaging app. what i do is i restart my xperia and after the restart all unsend sms will be send this time. does anyone encounter the same issue?how can i fix this?