Are service agreements stacked or updated on renewal?

If you are a software reseller, do you find it difficult for the vendors to  "stack" a maintenance agreement on top of an expiring agreement. Here's a typical scenario: End user receives a notice in the mail, via email, via telephone, letting them know that their existing maintenance/support contract is due to expire. This contact usually takes place around 6 weeks prior to expiration of the agreement. End user contacts reseller and asks the reseller to renew the agreement with the vendor. We contact distribution and request that the agreement be extended for another year. Distributor says "OK". Distributor sends request to vendor who puts the agreement into place. Resellers discover that the new agreement is activated IMMEDIATELY rather than upon expiration of the prior agreement. End result is that the end user loses out on the value of any time that remained on his old agreement.   Does this happen to you?