Wireless Connection Suddenly Slow

So, first of all, I have two PCs in my home, one connected directly to the router, the other connected through the wireless network. I use the wireless connected PC. In the past I've had some issues of my connection cutting out on random occasions for about a minute then reconnecting back. This happened to every single user connected to the network, including the one connected directly to the router. It was just a minor nuisance so I just put up with it. However, one day my internet just slowed down to a crawl and I don't think any hardware/software changes were made to cause this, but I may be wrong. What confuses me is that, now the internet has slowed down, the disconnecting issue is a very rare occurrence. It happens probably once a day, where as before it was much more frequent. I assume it has something to do with my network not being so strained. The PC connected directly to the router does not seem to have this issue, in the speed test below, it has a higher download rate, around 6-7mbps I think (it's pretty bad in this area, but it's usable).I have done some research as to why this is happening, but there are so many different diagnoses for a slow internet that finding the one I'm having is really difficult. I thought it was just my ISP performing maintenance but it's lasted for about 4-5 days now.