See if there is still some water left in the tub, which would indicate a drain issue. A front load WM will not go into high speed spin if it detects excess water in the tub. If there is water, there may be a small door at the bottom of the front that leads to a drain pump cleanout. You would not believe the things I have found that can block a drain pump. Have a wet vac and towels ready, because all the water remaining in the WM will have to be sucked out as you open the cleanout. If your problem is not excess water, it could be a control issue or a problem with the stator motor at the rear of the tub. You would probably need a service tech to check it out then.