If the alien granting extension of stay permit in The Kingdom for the reason of working at a business company/organization etc., resigns from such company / organization, his/her stay permit will be immediately terminated. As a consequence, The stay permit of his/her dependents will be terminated as well. Work Permit and Stay Permit must be revoked by competent officials.
According to the New Regulation from August 13, 2013, when submitting application for Visa Extension if the validity of passport of the applicant is not longer than one year left before expiry, the extension of stay will be permitted not exceeding the expired date of passport.
After the renewal of your passport of obtaining a new passport, you have to re-apply for Visa Extension by submitting required document and paying extension fee ( 1,900 Baht ). In case of overstay, the fine is 500 Baht per day.
The alien, who is holding the certificate of residence, wants to change the new certificate of residence due to the old one has no space for endorsement or damages. And the certificate of residence is issued at Bangkok, then the alien can be submitted the application form through the internet
You could apply an extention stay at every the checkpoint except at the Suvarnabhumi Airport Checkpoint.
You could apply a re-entry permit at every checkpoint. However at Suvarnabhumi Airport Checkpoint would provide this service if necessary depend on officers approval.