Do you have automated tests that run after your build? When do you build and do you have continuous integration (regular builds on check-in to scm?). If you do

Do you have automated tests that run after your build? When do you build and do you have continuous integration (regular builds on check-in to scm?). If you do then store every build and automated test results data. Try Tesults for this (https://www.tesults.com https://www.tesults.com) - I am the founder and one of our programmers can get you setup, contact me directly if you want or email support. Basically this will narrow down the introduction of issues to a specific build and as long as the associated change/revision has been recorded with each build it will narrow it to down to a specific change or narrow range.