Termites survived fumigation

[Nathan Olds]

When i purchased my first property in June, there was evidence of drywood termites so I got the property fumigated before a tenant moved in. About 3 months later, the drywood termites are back and active. Has anyone had this happen before where fumigation does not kill off all of the termites? 

The warranty covers getting it fumigated again but because there is a tenant now living there, i would have to pay to put her and her dogs in a hotel for several days or I can wait until her lease ends and fumigate between tenants. Any thoughts?