There is a conversation between the laser and the cloud when you turn it on. It goes something like this;
From the parked position the machine sends the head in the direction of the lid camera. (Weather that is directed by the machine or the server I don’t know)
The camera images the position of the head and sends that to the server.
The server sees that and calculates the steps to get the head closer, and sends that to the machine.
The machine responds and moves the head as directed, images the bed again and sends that to the server.
The server again sends direction to the machine.
The machine completes the instruction, images the bed again and sends that up.
This continues until the logo on the head is directly below the camera.
At this point the server knows the exact position of the head.
The head slides all the way to the left, and the gantry moves a fraction forward and another image is sent up. The server responds and the gantry moves a fraction back, image sent up.
At this point the machine and the cloud are synced, and the server directs the head back to the upper left starting position.
Any interference in that relay and the calibration fails.
I’m no authority on signal strength, but I know that just because I’m able to type this out and send it doesn’t necessarily mean that my connection has the integrity to operate the glowforge.
Have you tried creating a hot spot on your phone? You might check the operation that way against the machine’s performance with your WiFi.
It would be terribly frustrating to be constantly hung up in calibrating.
The biggest problem I ever had with WiFi was due to using a combination modem/WiFi router. It wasn’t a cheap unit either. It was solved by buying a$25 stand-alone WiFi router and connecting that downstream of the modem.