host can't ping pc 5324 but pc5324 can ping host

There is network, about 600 device, some vlans, and problem: from time to time some host (mainly linux) can't ping (and arping, telnet, http also) some pc5324. Another switches (cisco,hp,extreme) are ok. The problem is only with powerconnects. In arp table in Linux, there isn't entry about pc5324, but in bridge table in the pc5324 there is entry about linux. When i ping from pc5324 to linux, then the linux answer correct and since this moment, the host can ping pc5324. I think that the powerconnect can't answer for arp request from linux. Have someone similar problem? SW version 2.0.0.40 ( date 16-Jan-2007 time 12:24:45 ) Boot version 1.0.2.02 ( date 23-Jul-2006 time 16:45:47 ) HW version 00.00.02 sh bridge address-table count This may take some time... Capacity : 8192 Free : 7446 Used : 746 Secure : 0 Dynamic : 746 Static : 0 Internal : 0