Wired camara is jerky

I have several wired cams, one of which works well in terms of smoothness.  The other two are located at a corner of the garage and when I watch it live it studders ever second or so.  The images of grass on live change and recordings have 1 second gaps in them.  The only difference is that the signal strength is 50 on the good cams but about 62 on the others.  I have a new mesh router and can set the link to be 2.4 or 5 GHz but to no avail.  It almost seems like the units could use more buffering memory but what sticks out is the signal strength.  I've ordered a 4th mesh unit to put in the 1st floor garage almost directly below the cams so we'll see what happens. Anybody else have this issue?