Irrigation leads to hot water issue

I've been doing take offs this year on the regular with no issues, except for one house. Their irrigation comes on early morn before they wake. When they get up and turn the hot water on it looses pressure to almost a trickle, bangs, and comes full flow. (no problems with cold)

- I changed the dual check and still issue.

They also say it only happens after the irrigation has cycled on and complete. I was thinking maybe obstruction in hwt, but if it only happens after irrigation is on then wtf?

fyi - I teed off close to the meter, all 3/4, with shut off, then check valve before it exits the house.
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