Rendering Device Lost errors are a problem with a player’s graphics card crashing. Its frustrating, but players have to stop playing Competitive entirely and work to fix the problem. Sorry, but if you have been season or permanent banned, this is a matter of repeatedly and negligently reentering competitive.
Additionally, neither seasonal bans nor permanent Competitive Play bans will decay or reset over time; once an account is permanently banned, it currently cannot return to good standing.