Why isn't my exchange email syncing?

Please help.
I had been having problems with my Samsung Galaxy S4 only syncing exchange emails once per day which is usually at 1 minute past midnight (using the stock app) bringing in all the previous days mails.
Some days they will sync up to approx. 2.30pm in the afternoon and then stop syncing until midnight. I have tried everything I can to fix this eg: uninstalling / reinstalling account, checking all sync settings including master sync.
To let me continue receiving my work mails through exchange I downloaded Aqua mail from the play store and this works perfectly sometimes even getting my emails before my work PC.
Now it gets interesting - during the summer I was without my S4 for 2 weeks and was using a brand new Nokia Lumia 630 for the 2 weeks and I encountered the exact same problem when exchange was loaded.
Now I have a brand new Samsung Note 4 and the exact same problem has occurred when exchange account was loaded - now using Aquamail to get by.
6 people in my office including me have all received new Samsung Note 4 devices and don't have any problem with their email sync and all phones have been set up by the same IT person (previously they were all using iPhone except me).
I have also had a new sim card issued in case that was causing a problem but no joy with this either.
One final thing to think about: My carrier is O2 Ireland and earlier this year I was in Spain and exchange mails were syncing 100% on time and recently in Germany and 100% on time. Once back in Dublin the syncing on time disappears.
EVERYBODY IS USING THE SAME CARRIER AS THESE ARE ALL WORK PHONES.
ACTUALLY IT IS ONLY THE IN BOX THAT IS NOT SYNCING ON TIME - EVERYTHING ELSE IS WORKING PERFECTLY.
Any help please?
PK

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