Why is my cache clearing? I get low PLE

Monitoring the system today returned the following:
In our production server we have 32GB of RAM
SQL uses 26-27GB
6 GB (static) of that are "stolen" – used for other stuff that are not database caching or managing.
0.5GB (static) are used for locking.
All night long the free memory was just below 2GB and that is good. It means we have enough memory for all databases.
At 7:45 AM the free memory grew to 10GB and at 8:00 to 16GB. We don’t need this memory free, we need it for cache.
The cache that was all night at 20GB dropped to 11 GB and during the day varied to the lowest level of 4GB.
The bright green line is our goal, "Page Life expectancy". With hour memory it should be days,
but it is now averaging about a minute and a half!
Free memory is not a need of the system so it is strange the cache is being depleted by it.
sould I sample data in a higher rate, maybe something else is stealing the cache and returning free memory very quickly.
what could be the issue?

Thanks Shanky,
here are the results:
Memory_usedby_Sqlserver_MB Locked_pages_used_Sqlserver_MB Total_VAS_in_MB      process_physical_memory_low process_virtual_memory_low
26904                      0
8388607              0                           0
Microsoft SQL Server 2012 (SP1) - 11.0.3153.0 (X64)
Jul 22 2014 15:26:36
Copyright (c) Microsoft Corporation
Standard Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: ) (Hypervisor)
It is dedicated to data only (no ssis,ssrs,ssas)
One instance.
max memory 27GB
Should I change minimum memory from 0 to 20GB?
I can cause real memory preasure by reading all transactions. I even managed to produce:
An error occurred while executing batch. Error message is: Exception of type 'System.OutOfMemoryException' was thrown.
But not here is my problem. My issue is when there is pleanty free memory and cache gradually reduces.

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Why is my cache clearing? I get low PLE

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