TCAS/RA Issue

[TCAS]

Hello, flew a couple of flights in the VATSM with the A350, but it appears that when there is another aircraft within 20nm of my aircraft, even if they are 2000 feet apart and not climbing/descending and is flying away, it would trigger the RA, and the RA in the PFD won't clear even if there is no traffic in the vicinity. If there is a workaround it, it would be wonderful

 

Attached a picture of the PFD still displaying the RA after being offline with zero traffic for the past 8 hours