It could be T-Mobile 5G testing and deployment, along with the resulting television station repacks, that are causing the issues with the wireless.
T-Mobile should be in Phase 4 of their 5G deployment, which according to the video below includes the northern tip of Virginia. It's scheduled to finalize in two weeks. Phase 5 deployment is scheduled for a larger chunk of Virginia during the month of August and end the first week of September.
Phase 4 in the video is shown just after the 30-second mark.