tmobile home internet speed issues

I've had this service for about six months. It was great until a few weeks ago.  We only connect one device at a time (a tv or a laptop) but we can't even watch an episode anymore.  It will play for a few minutes, then we get to watch it for awhile as a big blur, then plays fine, then just quits. Might get lucky and be able to unplug the box, or reset the connection, but it takes forever to watch anything this way.   We cut off our satellite after a few months of having this internet because it worked so well, so now we are stuck with this.  There is NO other internet available in my area… getting really tired of this.