Keep loosing Personel hotspot

Hi,

I have my iPhone's personal hotspot on all day connected to my mac via wifi.
I never used to have any issues until I updated to IOS 6 a few months ago.
After that I had a lot of problems connecting, I would have to switch off, switch on, etc then somebody suggested reset network settings so I tried that and
hey presto, it fixed the problem, well almost :(
2-3 times a day the internet stops working, it is still connected to my iPhone but it dosnt work so I have to reset network settings on my phone again which
is a pain in the ass.

Anybody else having issues?
Any ideas how to fix this?

Regards,

Jeff