Title company not wanting in insure sherrif's deed

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I bought a property in a tax sale in Montgomery County, TX.   It is not Homesteaded or Agriculture, and 6 months have elapsed since recording of the sherrif's deed.   I have a buyer interested, but their title company will not insure it, stating 2 years must elapse before they will insure it.

Has anyone come across this before and can you recommend a strategy that will enable me to sell it before 2 years expires?  Obtaining quiet title?   Finding a different title company?   Other ideas?   Thanks!