GE wbvh5200j3ww spin cycle slow - General Electric WBVH5200J Front Load Washer

The biggest issue with these and all electronically controlled appliance is that they are susceptible to power surges and voltage spikes from your power grid. We are cautious enough to put our computers on a voltage spike suppressor, but not our computer controlled appliances. Since this particular issue is addressed when a trouble or fault code is displayed and you did not mention this, it could be any number of issues, but my money would go on a faulty motor control board. Now these are not inexpensive and without the trouble/fault code I would not recommend you buy one and replace it without an appliance repairman taking a look at it. Oh, and plug your appliances into a voltage spike suppressor they make them for both 120/240 systems.

Sounds like you have a bad board and needs to be replaced.
Is this washer under warranty and if not did you take out an extended warranty?

It's possible that the tub didn't drain properly in the allotted time and the remaining water is slowing your drum from coming to maximum extraction speed.

The motor reverses rotation to spin. Your motor is going bad.

The motor could be on its last leg of working. You can also check to make sure that the belt is not binding against anything under the drum. You may also want to make sure that the conterbalance weight is not hitting the belt. Make sure that your machine is lever and that it does not walk during spining.

I would remove the back and investigate for mouse/rat damage. If you had them in storage a rodent may have made himself a home. They like to chew thru wires and plastic components. Or a wire connection may have come loose when you moved them into storage or back from storage.

Clean out the drain pump AND connecting hoses.

To Reset computer. Unplug for 2 minutes, plug back in, open and close lid 7 times slowly to reset computer. This should solve your problem.

If there are 2 belts, change them both. one can get damaged and not allow the other to work right.

front load machines will normaly spin slow on first part of spin cycle this helps distribute load evenly before hi speed spin also if load is extermely off balance ..a large towel with load of light fabrics will never spin to full speed due to off balance produced by wet towel hi speed spin is normaly acheived in last 3-4 min of spin cycle