Give the Selling180 process a try. Start with the Stalled Deals Module and see if you don't get an immediate response from a prospect that you thought was a lock and now won't respond to your calls/emails.
This Module includes an instructional video by the author, Tom Batchelder, and includes a step-by-step guide and 8 sample emails so you can get started right away.
Module 5: STALLED DEALS — You had a great call/meeting with a prospect, you thought things were moving along and now you can’t get a response. Crickets. Sound familiar? Learn techniques that will get a response 75% of the time.