I have encountered same issue as Random game freezes after patch - #10 by Lessamegwyn-kirin-tor.
And each time the game freezes, memory usage is increased by ~800MB. In less than 1 hour, the Wow.exe has already consumes 7.4GB of memory, with all addons disabled.
This is output of Sysinternal’s VMMap:
"Process:" "Wow.exe"
"PID:" "11916"
"Type" "Size" "Committed" "Private" "Total WS" "Private WS" "Shareable WS" "Shared WS" "Locked WS" "Blocks" "Largest"
"Total" "16,336,960" "11,414,004" "11,165,756" "7,687,028" "7,566,444" "120,584" "120,584" "24" "11111" ""
"Image" "120,136" "120,136" "15,488" "15,308" "1,088" "14,220" "14,220" "4" "573" "39,552"
"Mapped File" "91,084" "91,084" "" "62,492" "" "62,492" "62,492" "" "37" "16,384"
"Shareable" "74,820" "52,168" "" "43,852" "" "43,852" "43,852" "12" "32" "38,912"
"Heap" "2,885,108" "2,861,768" "2,861,704" "2,063,088" "2,063,084" "4" "4" "" "4679" "77,016"
"Managed Heap" "" "" "" "" "" "" "" "" "" ""
"Stack" "39,936" "19,636" "19,636" "5,424" "5,424" "" "" "" "429" "1,024"
"Private Data" "13,108,572" "8,269,212" "8,268,928" "5,496,864" "5,496,848" "16" "16" "8" "5361" "4,194,432"
"Page Table" "" "" "" "" "" "" "" "" "" ""
"Unusable" "17,304" "" "" "" "" "" "" "" "" "60"
"Free" "137,422,616,448" "" "" "" "" "" "" "" "210" "135,582,363,712"