Repeated False Detentions at Airport

I obtained my settled status 5 months ago. Since then, I'm having trouble at border control. When Border Force officer scans my passport, the system shows as if there's an issue with my visa, then they hand me a detention form and take me to the waiting area to wait until they do further checks. After ~30 minutes they come back apologising and let me in.

I ask for details why this is happening to the Officers and the answer is always "I have no idea". The system somehow shows a warning to them. Only when they do further checks, they find out that everything is good. This happened 3 consecutive times in the last 5 months.

I've been in the UK for 6 years and it had never happened before I got my ILR. And I've never been in any type of trouble with Home Office or the justice system.

I emailed complaintscompliments@homeoffice.gov.uk 4 weeks ago but they did not get back to me.

Does anyone have an idea why this might be happening and what I should do next?

See post1566960.html#p1566960 or post1979363.html#p1979363 for similar stories and guidance.

Thanks @meself2.

They've replied to my email saying that it's fixed now.

...
However, I am sorry for the delays you have experienced. Following your complaint an
operational manager has conducted a thorough examination of our records and has
confirmed you should not be delayed when you travel again in the future.
...