Erratic email downloads

I had been receiving a new Samsung S5 Phone end of Dec 2014 when renewing my contract with MTN.<br> <br> IMEI R58F90MN1FP(***)<br> <br> <br> I do have problems receiving email on this phone.<br> Erratic email downloads.<br> My email account works well on any other device. <br> Nothing to do with the data or wifi - stays erratic<br> Then there is a few emails then nothing for weeks and then suddenly again.<br> I cannot run a business like this.<br> <br> I had taken it several times to the store in Cresta where they updated it with the newest software. <br> Also it has been at the service Centre of Samsung in Roodepoort where they also updated the software.<br> Still erratic.<br> <br> <br> The problem seems to be with the phone.<br> <br> Susan Berry<br> <br>