| Let me explain what's happening and then I'll give you the solution.
You have a partial blockage in your drainage line. You washer pump discharges with great force and volume, when it hits the clog it bounces back sending a bubble of air ahead of it. That's what you see in your toilet bowel. The solution is to snake the drain from either the washer roof vent or the lavatory roof vent from the bathroom that bubbles. Put out enough cable to reach the base and about 20 more. Test by cycling the washer. Good luck, Tom | 
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