Update to Data will not reconnect once lost

i started a thread called " Data once lost wont re-connect" back in June
I still don't know what the problem is caused by but it's definitely lollipop related.
i have possibly tried every lollipop rom there is to try and it's always the same.
i'm a driver and cover the whole of Scotland, sometimes some obscure places
with no DATA signal..Once the exclamation mark was up then only a reboot would
sort out the problem and reconnect the DATA. I have tried 3 phones and they all
have the same problem. Now all the phones are on the Three network so it could
well be an incompatability between Three and lollipop??!
I have wiped the phones and put in 38r and 44s and i have not had to reboot
any of the phones this week so it looks like the problem is not apparent on KitKat.
I'm starting to enjoy the Oneplus once again !!!nearly had the samsung edge a couple
of weeks ago!!!
I was thinking that i might of been the only one with this problem untill it happened to the wife's
phone when on holiday.The daughter gave up her phone and went back to an iphone so tried hers on lollipop
and the same problem .
Hope this might help somebody out there it's been driving me insane and although i have had to forget lollipop
and go back to KitKat the phone is now back to being usable and i get my emails and whatsapp when i'm supposed to
Paul