There can be a number of reasons for post hysterectomy bleeding so don't panic at this point but do seek medical attention.
To help you and your medical team figure out what is going on, you should also keep a detailed symptom diary
Because you have your cervix and and at least one ovary, yes the issue could be a mini period even this far out. Possibly your hormone levels have changed causing the mini periods to begin.
Additionally, if any adenomyosis was left with your cervix it may have progressed to a point that is now causing the bleeding and cramps in response to hormones.
You should at least ask if you need a pelvic exam to make sure all is well. Depending on the reason for the bleeding and cramps, your doctor could prescribe progesterone or progestin or even birth control pills to help.
As you know, over time our body goes through various changes and as it does we can acquire new health concerns. With your DH deployed, you may also be dealing with stress that is triggering health issues. Stress can affect our hormones which could then trigger some issues.