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First of all if you are using vaux-com 120309a the firmware its fw1.45
No need higher. The last firmware version is fw1.64
You an upgrade or downgrade you tool firmware as you wish with any fw versions at least you have a good PIC18F458 inside
The issue connection in what car/model/year is happening?
Good luck

Hi, yep using Vaux-Com 120309a with firmware 1.45.

Yep, definitely have genuine chip, it is not scratched on top and is printed.

any benefit to upgrading to 1.64?

It is a Vauxhall Vectra B 2001.

Doesn't matter what ecu im trying to connect to, ABS, ECM etc, I can connect fine, I can clear error codes fine... but if I go into live data it will start off working fine, then stop working after varying amounts of time, sometimes within seconds, sometimes a minute or 2... or earlier had it working for a few minutes.

once it stops working, if I try to clear fault codes it will give me a timeout error.

If I close Vaux-Com, re-open it wil connect again fine and read live data until it times out again.