Woo / PayPal Pro Hosted randomly not connecting

Hi,

I’m randomly getting failed orders due to something hanging between the Pay Button and PayPal.
Customer clicks pay, Dialogue pops up saying “wait a second…” and then it never connects. But not all the time. Most orders go through fine.
I can’t work out where the error’s occurring or what’s causing it, it happens on both mobile and desktops, but only sometimes. It almost picks a customer at random and says “I don’t like you”
Also, very occasionally order statuses don’t update from Pending to Processing which may or may not be related.
Anyone have ideas? I’m at a loss. I do know it only started a week or so ago, but everything is up to date.

Thanks in advance.

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ps – I’m not sure where to put this so I’ve lodged this on the PayPal Pro Hosted board as well.