I count at least four.

1/ "The God Gambit" - arrival of Decepticons to Titan.
2/ "The God Gambit" - later arrival of Autobots to Titan.
3/ "Money is Everything" - arrival of Technobots to Titan.
4/ "Money is Everything" - Technobots encounter Quintessons and Terrorcons on Titan, which means that they must have arrived on Titan prior to their arrival.