Repost note: This item is a retweet by Sh1n (Dave) (@hey_itsmyturn) of a post from @DefenceGeek. The claim belongs to @DefenceGeek, not to @hey_itsmyturn.

@DefenceGeek wrote, referring to the reported US ground stop:

Regarding the US ground stop from reported loss of ATC radios...

The available text ends there. No further details — such as affected facilities, airports, times, or sourcing — were included in the post as captured.