Connectivity issues (Wi-Fi & Bluetooth Controller)

[ArcticLion]

Hi, community!!!
I am gonna try to be as short as possible, once I am going to describe multiples bugs/issues I’ve being facing since my last update (from version 5.o or something to 6.1.1).
Btw: my device is a Raspberry Pi 3 B.

1. Can’t connect to wi-fi.
   Before the update it was easy and always connected instantly to my wi-fi. Now I have to use a cable. And even re-inserting my network information it does not connect to it.

2. My controller disconnects after resetting my device.
   Before I just had to turn on both of them and they were ready to go. Now every time I turn my Pi on, I need to pair my controller (Wi-U pro Controller – Bluetooth) from scratch. > For that I need to use a virtual gamepad via my network internet.

3. Performance issues… Those are minors at the moment. But unfortunately games that run great before now are more laggy. > That maybe due to my power supply that is displaying a lightening bolt at the top of my screen. So – by now – I can’t blame the software. However, everything else is like before… so I don’t believe it should be that bad.

Well … there are a couple more issues, but by now these are the ones that are really bothering me (especially 1 and 2). If someone could help me out pointing me to a solution that would be awesome!!!

If you need any additional information let me know.

Thanks.

[ArcticLion]

Btw ... pretty sure I upgraded from 6.0. >>> Still tried out a fresh install ... but problems continue.