Xfinity Stream on Xumo

I have two Xumo boxes.  Until recently both boxes worked fine until one day the bedroom box got error TVAPP 05005. Other apps work except of course NOW TV. The virtual assistance wasn't helpful...  tried ALL suggested fixes SEVERAL times to no avail.  I've spent waaay too much time with this.  This kind of issue is why I no longer have cable.  Is there a fix for this or should I just give up and keep the box that works? BTW both TVs are Samsung. Thoughts???