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Changing the java heap size used by the product has been supported for quite some time but should be done with caution as it may cause OutOfMemory errors.
According to that PMR, the OutOfMemory exception was caused by the inability to create more native threads. Other cases we have seen like this were caused by other processes that were running on the PC that are not part of ACS. Either there are too many active threads or some other process is not freeing up the threads when they are done. The PMR was closed before the data could be collected that would verify whether or not these threads were created by ACS or some other process. If ACS is not able to create a thread, the JVM throws an OutOfMemoryError. Increasing the JVM heap size for ACS will not help in these cases. Also, the PMR references setting the JVM heap size to -Xmx1024m. That is already the default heap size used when starting ACS. The most likely reason the issue could not be re-created is because the PC was rebooted and/or the other processes using up all the native threads were not run.
If the issue continues to happen, I suggest you work with Service to gather the necessary data that will help determine who is using up all the native threads.
PMR Number is 26221,659,760.
Please open a PMR and work with our Service team so the cause of the OutOfMemory exception can be determined for your specific case. When you have done that, provide the PMR here so we can further evaluate this request.