Most probably, your eBay account has reached monthly selling limits. eBay reviews your account every month and adjusts the limits automatically based on your volume of sales and the feedback you've received from buyers.
You can manage your selling limits at Seller Hub. Go to the Overview tab and scroll down to see the monthly limit section.
Note: You should also check M2E Pro Revise Rules at eBay > Configuration > Synchronization Policy and decrease the number of revises on eBay.
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