Rockville Town Square took another hit this week with the closing of Pandora Seafood House & Bar, which replaced the failed American Tap Room just a year ago. The glitzy restaurant, which is exiting amidst legal battles over its rent and lease agreement, joins Mellow Mushroom and Dawson’s Market in a fall exodus that may not be over yet. The nearby Apollo restaurant also is planning to leave, Samovar has been closed for several weeks due to water damage, and some other Town Square tenants say they may not stay much longer. At a jam-packed community meeting this week, two types of complaints were voiced repeatedly: Rents are too high for tenants to make a profit, and visitors resent paying for parking when it’s free at almost every other shopping center in Rockville.