My hotspot goes away

I've been having to use my iphone to get internet on my laptop, and there have been days where it runs smoothly and without interruptions, other days where it goes very well for hours and it's easy to re-connect, but lately it has been only working for like 10 minuts and then the connection dies, wether I'm connected via wifi or usb, and I have to try a long time for my laptop to connect again, only for the connection to die in a few minutes, it even says that it has limited acces to internet, or not access at all in my laptop, but that's only somtimes. I have a full signal on my phone and my mobile internet doesn't get slower or gets cut off after using it a certain capacity, so why does the hotspot dies? Thanks, I really need to see what I can do about this, since I won't be able to get actual wifi for a while :/