Delphi Shared Module for Apache Runs Out of Memory - delphi

Question

I hope someone will shed some lights on issue I am having.
I am writing an Apache shared object module that acts as a server for my app. Client or multiple Clients make SOAP request to this module, module talks to database and returns SOAP responses to client(s).
Task Manager shows httpd processes (incoming requests from clients) in Task Manager using about 35000K but every once in a while, one of httpd processes will grow in memory/CPU usage and over time reach the cap of 2GB, and then it will crash. Server reports "Internal Server 500" error in this case. (screenshot added)
I use FastMM to check for memory leaks and it does produce log but there is no memory leaks reported. To make sure I use FastMM properly, I introduced memory leaks and FastMM will log it. So, my assumption is that I do not have memory leak but that somehow memory gets consumed until 2GB threshold is reached and not released until I manually restart Apache.
Then I started taking snapshots using FastMM's LogMemoryManagerStateToFile call to create memory snapshot at the time of call. LogMemoryManagerStateToFile creates file with following information but I dont understand how is it helpful to me other than telling me that for example 8320 calls to UnicodeString allocated 676512 bytes.
Which of these are not released properly?
Note that this information is shortened version of created file and it is just for one single method call. There could be many calls that occur to different methods:
FastMM State Capture:
---------------------
1793K Allocated
7165K Overhead
20% Efficiency
Usage Detail:
676512 bytes: UnicodeString x 8320
152576 bytes: TTMQuery x 256
144312 bytes: TParam x 1718
134100 bytes: TDBQuery x 225
107444 bytes: Unknown x 1439
88368 bytes: TSDStringList x 1052
82320 bytes: TStringList x 980
80000 bytes: TList x 4000
53640 bytes: TTMStoredProc x 90
47964 bytes: TFieldList x 571
47964 bytes: TFieldDefList x 571
41112 bytes: TFields x 1142
38828 bytes: TFieldDefs x 571
20664 bytes: TParams x 574
...
...
...
4 bytes: TChunktIME x 1
4 bytes: TChunkpHYs x 1
4 bytes: TChunkgAMA x 1
Additional Information:
-----------------------
Finalizing MyMethodName
How is this data helpful to figure out where memory is being consumed so much in terms of locating it in code and fixing it?
Much appreciated,