On April 9th, 2020 we filed a partial waiver of lien for amounts paid so far on a large commercial project. On April 28th, 2020 we filed a Release of Notice of Furnishing Prof Services as the developer needed it for change of ownership within their company. We received timely payments after the change but now are not getting them and calls are not being returned. Should be stop work and can we file a new lien?