Hi. I have an issue with my car. It happened twice since I bought it in May 2022. When trying to start the engine I have a fashing warning light for glow plugs come on and engine won't start unless I press and hold the ignition key until it starts again. At the same time I have a message dipsalying automatic stop start system failure. Any idea what's causing it? Thank you. It's an audi a4 Avant 2014 B8 sline