I am using Google Sync on my iPhone. These are the instructions that google provide on how to set it up - Set Up Your Apple Device for Google Sync : Google Sync - Google Mobile Help

I already have an Exchange account setup on the phone, this is my work address.

I am only using it with mail just to test at the moment. But it will only receive e-mail when it wants. Sometimes the e-mail works flawlessly and then it stops receiving e-mail without any errors.

Does anyone have any ideas please?