I often get really bad foot cramps in skiing, snowboarding, ice hockey, etc. I run, I stretch, I eat bananas, I have used after market and custom footbeds, but I still often get foot cramps. Interestingly, I can take a 15-20 minute break after it happens, take my foot out of the boot, relax/massage my foot, warm it up if necessary, and I won't get any pain the rest of the day. So, consider just giving it a rest and see if it helps.
Separately, I sometimes get a specific pain in my lead foot when I am really driving my weight forward. I have to relax and let my weight stay more centered and make sure I'm not rotating my hips forward. It happens sometimes when I work on riding switch, too, so I'm sure it is a form thing. I just try to focus on keeping my hips and shoulders aligned with board, which prevents my weird twisting.