I will be happy to help you out. Can I get the model number to you machine?
Is the machine completely filling before it stops?
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It almost sounds like you may have a bad water valve. The humming sound, is that coming from the back of the machine? If you open and close the lid, this will start and stop the water valve.
Try this for me. For the initial fill, select only cold/cold and see if you have the problem. Check the flow of water.
Then empty the machine and start over, but this time fill with HOT water only. Check the flow of water.
Give these things a check for me and let me know what you find.
Let me know how you make out. I will be on here for a while tonight.
After this load, before you run the test, turn off the water supply to the machine. Now unscrew the water lines from the back of the washer. Check inside the valves where the lines screw on. There should be some screens on there. Make sure they are not plugged up with residue.
If either the hot water side of the valve is failing or the cold side, the whole valve will have to be replaced. It is possible for one side to go bad and not the other.
Again, let me know what you find.
That is usually the cause. I would give the screens a look and see what you find.
Worse case you may have to replace the valve. This is a rather easy repair if cleaning doesn't fix the valve.
If you have anymore questions please feel free to ask.