Adult rescue dog occasionally, infrequently pooping in the house, any advice?

We have a 4 year old rescue we adopted 3 months ago (Husky mix). She is potty trained and most days she does fine. However, she has been having poop accidents in the house since we got her (maybe 1-2/month or about 5-10 times since we got her). It typically seems to happen when she has an upset stomach (usually it's diarrhea/soft, not always), and when we are not around (either when we are at work/out or sleeping, and she sleeps in the living room). She always does it in the same spot on the rug. We feed her twice a day (around 7 AM and 5-6 PM, though she sometimes won't eat breakfast until noon), and take her out 4 times a day (AM, noon, after dinner, and before bed). We work hybrid, so usually home but go into the office or a coffee shop to work a few days a week. She does seem to have some separation anxiety (gets upset when we leave or when she's alone for long periods), I'm not sure if this is related but most times we leave, she has no accidents. For example, she sleeps fine in the living room every night on her own and has pooped in the house overnight maybe 1-2 times. I'm struggling with knowing what to do since it's so inconsistent, and she seems otherwise very happy and healthy (vet checks have been fine) – she eats the same kibble every day and seems to tolerate it (Costco chicken and rice), her pee/poop is usually normal and outside, she usually is fine when home alone (no accidents), and occasionally has diarrhea/soft stool a few times since we got her but usually it is totally normal (normal 95% of the time). Is this normal for dogs to do?? And any advice or tips greatly appreciated!!