UPS recently announced several upcoming fee increases. In addition, effective June 4th, they will be assessing a new Shipping Charge Correction Audit fee if the average shipping charge correction is greater than $5 in an invoice week. If you are shipping packages that qualify for dimensional rating but a) do not provide dimensions, b) provide inaccurate dimensions, or c) provide inaccurate/estimated weights, this new fee could very well be assessed on your upcoming UPS invoices.
Multi-Carrier Shipping Blog
Major parcel carriers like UPS and FedEx have started running into issues during peak season shipping, not only in handling the increased volume, but in being able to maintain a profit during the peak season as well.