Internet speed drops to zero for 2-4 seconds every 20-60 seconds. Effectively killing the coection

thank you for reading this!

My machine specs:

• HP Envy 15'' Laptop
• Windows 10
• 8GB Ram, Inte Core i7-4700MQ 2.40GHz, 64 bit system
• WiFi adapter: Ralink RT3290 802.11bgn

I could talk shit about this laptop for hours but for this specific issue:

Issue

My inteet WiFi download and upload speeds drop to zero frequently(every 20-60 seconds) for about 2-4 seconds and then they go back up again. This is not a big issue when downloading stuff or watching series online but it is so incredibly frustrating when skyping, playing online videogames etc. This is not specific to Windows 10 as it begun when I was ruing windows 7 or 8, can't remember.

Proof:

Download speed graph for a 1GB file

Upload speed graph for a 1GB file

What I've tried:

• Other computers on the same WiFi: No other of my machines have this problem and neither do any of my 5 flatmates.
• Other WiFi networks: This does indeed happen when coected to any other WiFi routers (so my laptop is the problem)
• Uninstalling the WiFi Driver and installing again. Tried thrice, did not solve the issue (maybe I did it wrong?)
• I even used that Windows 8 option to restore the laptop to factory settings while keeping only files, did not work.
• Lots of other random things that did not work either.

Help, I live 2000km from my family and friends and me and my girlfriend and I spend 3 months apart every year, I need to be able to Skype but as of now it's such a painful experience every time. Normally, I can fix most of the problems on my PC by myself but this one will make me go mad.