Required field validation false positives

I'm getting occasional false positive validation errors on a required field -- meaning that the field has a value, but the validator is saying it's missing. Any ideas on this? It seems to be intermittent.

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The markup is not unusual. My page is a bit complicated with several adjacent forms, but because it works fine most of the time, I'm confused.

I think the user may be entering something in an order that the page doesn't handle right, but I can't figure out what, and in any case it seems to me the validator shouldn't do this.

I'm using v4.15.5

Hi @adamfoneil,

Unfortunately this isn't a known issue and we haven't seen it before.

You can try upgrading to a newer version to see if it makes a difference.

I found that the binding is intermittently "dropping out" or stops working. Not sure how to describe it. It's not a validation problem specifically, but rather relates to a temporary loss of binding functionality. With validation removed and data entered in the field, sometimes the field will appear to be null even when not. I haven't found a solution. I tell users to refresh the page (which works), but data loss has already happened, and it's not a good experience for the user.