admin bug

I rent a dedicated server, Everything seems to run well , then a few weeks ago when admins are close together or bump into each other a weird bug started were we cannot open inventory and the chat I type can take up to 5 minutes to appear or open same for the use of items, Relogging into the server at the beginning seemed to fix the problem, then the issue became worse it doesn't seem to happen if players are together its mainly just the admins and now it also happens when admins are around players ,not all players but every second one especially if we are giving players a server tour. if admins persist in staying when this lag starts it did start to affect the whole server, and the server has to be restarted. often when this lag happens and the admins try relog the server won't let us back on it just keeps timing out and a server restart is required, the server does restart on a schedule ever 6 hours, I have 32 g of ram we use about 6% and 2 or 3% of our CPU and I just cannot work out why we keep having this problem, Us admins avoid each other like the plage, Everything else seems to be fine as long as the admins stay away from each other and most the players and don't try show anyone around, I have made some consol reports and nothing seems unusual on the web consol when this happens