Yeah, will happen a lot when on A300/734 coming in from Intl sectors, they will frequently be operating a domestic sector next so you may park at a domestic gate and have to take a bus.

It also happens a lot when taking a B744 or B777 domestic sector. Quite often these aircraft will be parked at an Intl gate and you will be bussed from domestic to the stairway up the jetbridge at an intl gate. It's a MASSIVE PITA but with Thai cycling the whole fleet between domestic and intl all day long I don't see how they can change it!