First of all, I will say that I don't think anyone should be banned and lose years of investment for bad play in one game mode. However As an FL enthusiast I will say that you are definitely playing the game mode wrong and should look up some guides if you plan to jump into it again.
There are some really good video guides on YT and a few solid written guides. You don't need to be sweaty, but you DO need to contribute. Exclusively camping nodes isn't contributing even if it feels like it is.

My sympathies that you've been dinged twice, but you can avoid a ban pretty easily: avoiding the game mode or checking out a guide.