You may be able to save a trip from your repairman
Did you know that too much concentrated soap can cause your high tech washing machine to stop dead in its tracks? The machine can get held up by a “suds lock” if there is enough soap buildup in between the inner and outer drums.
If you suspect suds lock, try using one third the recommended soap in a high efficiency washer. If there is a particular need due to very soiled clothes, try one half of the regular recommended amount.
If the machine makes a grinding noise, the inner drum is likely not sitting back down onto the spin bearings properly. Lift the inner drum up and down gently to help it settle down into place. If that does not work, fill the tub with hot water and let it sit for a while and try again. There is a lag time before the drain and spin cycle when cooling needs to happen to certain degree before the machine will kick in again.
Use a commercially available product such as Glisten to remove soap buildup periodically.