Wi-Fi crashes 1-3 times a day / does not work?

We received a new router from Vodafone.

Unfortunately, this does not run very smoothly. We have 1-3 Wi-Fi crashes (the Wi-Fi shows it, only then it does not work).

LAN runs through without problems.

I have already tried different channels on the Wi-Fi, but nothing helps.

We still have a repeater and a DLAN connector in this regard (does this affect the Wi-Fi / router)?

Is it better for a family of six to take a Fritzbox? Since we're each with a cell phone in the Wi-Fi, 4 laptops and 3 Smart TV's and then 2 PCs in the LAN.

Then take a look at the router log to see what happens if the Wi-Fi doesn't work. It's best to copy this in here.