Every year she seems to cut contact for the weeks lending up to and after my birthday. Normally we speak 1-2 times a week. There is never any falling out about it and she’ll phone me afterwards and talk completely normally like nothing happened. I just cannot work out her reasoning. Birthdays as a child were also minimal acknowledgment and never a party/cake etc but she did once throw herself a party with her friends on my birthday when I was like 7. I’ve never been that bothered by it but now I’m starting to think that she might have some issue with me.