Could be anything. Could be something with your electrical in your walls shorting out that caused it. You could of overloaded that circuit with other appliances or things. Get your electrical checked out and make sure your not exceeding the amp pull for your breaker and make sure you don't have a bad receptacle or wiring in your walls especially if it's an older house. Check the main board if you have 120v going to it and nothing responding it's either the main board or touchpad. Watch a youtube video to troubleshoot, good luck

Got any error codes that are popping up at all? Codes usually pop up on an error like this.

LF is long fill meaning possibly the inlet valve is clogged or the screen where the hoses come in or it could be a main board fouling out causing random codes or a wiring issue to the main board. It's very rare units cause a breaker to trip unless you have a hot wire touching ground to the unit or a wire harness issues grounding out. I haven't seen a main control going out on a unit and tripping a breaker in a long time. Check for melted wiring under the touchpad or underneath the unit first with a good inspection before thinking about purchasing a new main board if you blow it you buy it. Check your breaker you may have a bad breaker also it's possible i've seen it or you may have too many things hooked up to the same circuit or plugs that are shared with that washer an overload of the circuit causes it to trip also.