In fact, lower down the thread we can in fact see the OP mentions that rather than processing since 2018 "without issues" as they claim in their post they had their reserve requirements increased a few months ago by Stripe to 50% of revenue held for 90 days!
This is a very substantial reserve requirement and presumably there was a conversation between Stripe and the OP's company at the time about the fraud or risk profile that lead Stripe to impose these increased reserve requirements. Presumably whatever prompted the increase in reserve has got worse and caused Stripe to decide the business relationship is no longer worth it.
On the other hand - just 48 hours to leave doesn't seem like fair play. So either 1. the OP is misrepresenting the communications they've had with Stripe over the past few months (including how abrupt the shut down notice from Stripe actually is), or 2. Stripe really will make snap algorithmic decisions over the future of businesses without remorse...
Maybe there's a way for Stripe to show which it is without breaking any of their privacy considerations.