Question about ProtectiveClean 5100 - 644169

The toothbrush cleans great. But which usability whizz thought it was a good idea for the toothbrush to simply switch off after a defined time (about 2-3 minutes)? This has annoyed me briefly once every morning for 2 years. Sure. Just press a button and it's on again and after a while you do it automatically. But ... WHAT'S THIS NONSENSE? The constant short interruption after 30 seconds still gets on my nerves. I have my own toothbrushing routine. I decide when to switch from top to bottom or from left to right. And I decide when I've finished and switch it off. I also don't want a toothbrush that just goes off and beeps and has to be pressed several times when it thinks the brush needs changing. That may boost sales, but as an adult capable of making decisions, it annoys the hell out of me. There! I had to get that out. Things are better now. Thank you.