leak memory on RB500/RB133

I have problem with RB500/RB133 and leak memory. I have about 50 unit of routerboard on my network and this situation is only with four RB532/A and two RB133.
RB600, RB333 and RB433 has the same config and this problem don’t appear.
Memory all the time is to growe and after some time router is hung up, then only reset help.
All of my routers use OSPF, PPPOE and SIMPLE QUEUE for pppoe interface.
Look on this screen this is graphs from RB500R5 and RB133.
I want to mantion that I used different version of ROS and the situation is the same. Currently I use 3.17.
What should I do with this?
-sorry for my english but this is not my native language

regard.
BartD
RB133.JPG
RB500R5.JPG
rb500.JPG

disable logging

I disabled logging on RB532 and change FW+ROS to FW 2.18, ROS 3.22
On second RB532A I disabled logging and problem still to appear on boath RB.
RB532A.JPG
RB532.JPG

have the same problem on x86 Internet access server (pptp, queues)

support wrote that memory leak is somwhere in the kernel…
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