Hi @Marcopolo17, It shouldn't be too hard to work out what's happening, can you provide some information like what model router or access point you are using and what type and model devices you're having problems with. Are you in a house or an appartment? This info will be helpfull as well.
Hi @Marcopolo17 good that you're sorted, yes WiFi analyser software is very usefull. If you have an iOS device I recommend using the AirPort Utility app, it's free and has a WiFi scanner built in.
It's an official Apple app so doesn't have the pop up ads and bloating that some 3rd party apps have. With Android it's a minefield of good and mostly bad apps to choose from in this category. Good Luck