The Hubs and I decided to hold out a bit in regards to the email--maybe when it's closer to day 60... He said he wanted to know if he can move jobs while the visa is underway or if he should just stay until the visa is complete. I told him maybe it's best he stayed until the visa is finished.
Yes - if you are relying on his employment income to meet the requirements and he moves jobs now, it means you will no longer qualify for the visa.
If UKVI discover he no longer has the same employment, your visa could be refused. Also, when you enter the U.K. on the visa, they may check that nothing has changed since you applied, and if he no longer has the job that you relied on for the visa requirements, they could cancel your visa at the border and send you back to the US.
So, he should not change jobs until AFTER the visa has been granted and AFTER you have arrived in the U.K.
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