Hi Ahmed,

I confirm you that also this second case, Sept 10 at 14:54:36, seems to have the same trigger. A client (this time from a different ip) reconnects and submits about 40 times this subscription:
Code:
LS_session=S46d48811f64ddd75T5440006&
LS_op=add&
LS_table=29&
LS_id=ts1%20ts2%20ts3%20ts4%20ts5%20ts6%20ts7%20ts8%20ts9%20ts98%20ts131%20ts157%20ts132%20ts137%20ts138%20ts144%20ts146%20ts91%20ts166%20ts130%20ts86%20ts153%20ts94%20ts169%20ts83%20ts87%20ts97%20ts10%20ts11%20ts12%20ts13%20ts14%20ts15%20ts16%20ts17%20ts18%20ts19%20ts20%20ts21%20ts22%20ts23%20ts24%20ts25%20ts26%20ts27%20ts28%20ts29%20ts30%20ts31%20ts32%20ts33%20ts34%20ts122%20ts35%20ts36%20ts37%20ts38%20ts39%20ts40%20ts41%20ts80%20ts127%20ts114%20ts117%20ts155%20ts158%20ts161%20ts163%20ts168%20ts42%20ts123%20ts43%20ts44%20ts45%20ts46%20ts47%20ts124%20ts152%20ts135%20ts88%20ts156%20ts162%20ts164%20ts167%20ts170%20ts48%20ts49%20ts50%20ts51%20ts52%20ts53%20ts54%20ts55%20ts56%20ts125%20ts57%20ts58%20ts59%20ts60%20ts61%20ts62%20ts63%20ts64%20ts65%20ts66%20ts99%20ts134%20ts67%20ts113%20ts107%20ts101%20ts102%20ts115%20ts116%20ts151%20ts126%20ts136%20ts142%20ts160%20ts96%20ts68%20ts69%20ts70%20ts71%20ts72%20ts73%20ts74%20ts75%20ts76%20ts121%20ts139%20ts154%20ts77%20ts165%20ts95%20ts78%20ts79%20ts103%20ts81%20ts104%20ts82%20ts100%20ts105%20ts108%20ts106%20ts111%20ts110%20ts112%20ts109%20ts118%20ts119%20ts120%20ts133%20ts129%20ts128%20ts84%20ts85%20ts141%20ts140%20ts90%20ts143%20ts89%20ts148%20ts147%20ts149%20ts93%20ts159%20ts145%20ts150%20ts92%20&
LS_mode=COMMAND&
LS_schema=TradePrice%20TradeVolume%20TradeTime&
LS_data_adapter=PROXY_MarketBeat&LS_Snapshot=true
Please note that the 40 subscriptions are related to the same Lightstreamer session and that seem to be part of the initialization procedure.
Verifying in the log we found that this same subscription is present several times in the course of the day, and if repeated in a lower number of times from 4 to 10, results in a significant increase of memory that however is subsequently reabsorbed by the server.

Please, could you help me to understand if this Item (ts1%20ts2%20ts3...) involves a very large snapshot perhaps with very large fields too, such as an Item in COMMAND mode with a lot of associated keys.
Furthermore, I think you should investigate into the code of your client to try to prevent repeated subscriptions. I do not exclude that deleting them the issue will be mitigated if not completely eliminated.

As a last resort you may consider to perform a heap dump during a crisis.

Regards,
Giuseppe