HANA Memory"Bugs" in SPS * Rev 85

We seem to have memory growth issues that, over time (about 30 or so days), we need to restart HANA so the memory will be reduced (and it starts all over again). We also have BW on the HANA server and the HANA database has 512 GB memory assigned to it.

Are there memory issues (bugs?) with this version that would require us to upgrade to the latest version (we do plan to do that)?

What are any alternatives to memory issues with this version?

Thank you.