After Mercedes problems, Aston Martin also comes to a standstill on the first day of testing

After gearbox problems for Mercedes and Haas, now the Aston Martin has also stalled with a problem. Sebastian Vettel stopped at the end of the pit lane. The problem is unconfirmed at this stage. 

Problems for Aston Martin

Aston Martin returns to Formula 1 this season and has taken a good look at Mercedes, as did Racing Point last season. After problems for Mercedes, the Aston Martin is now also stuck in the garage after Vettel came to a standstill at the end of the pitlane.

Does Aston Martin have the same problems with Mercedes' gearbox, or is there something else going on?