There are various utility programs that might help you track down a problem.
1.
Your laptop's network monitor utility (in Control Panels). You can watch whether connection speed changes, packet numbers changing, etc.
2.
Did your network card come with a utility that shows connection speed? Etc.
3.
Did your wifi router come with a utility which shows you all its operating parameters? Such as transfer speed, how many people are currently using it? Etc.
You may find a setting that needs to be changed. It requires some know-how about what you're doing of course.