Steps to reproduce:
1. Open new project
2. Add Audio Source to scene
3. Select it in hierarchy
4. Observe in Task Manager Unity taking up more and more memory, while GPU usage is also spiked
5. Deselect Audio Source, memory is not cleared
6. Select it again, Memory keeps piling up

Expected: Memory is flushed, cleared or not even used unnecessarily in the first place
Actual: Allocated Memory keeps piling up without being cleared.

Reproduced on:
2018.1.0b8, 2018.1.0b10, 2018.1.0f1, 2018.1.9f2, 2018.2.10f1, 2018.3.0b4

Version 2019.1.0a3 (0e3c7820a690)
Sun, 30 Sep 2018 14:48:41 GMT
Branch: trunk

Not reproduced on:
2017.4.12f1, 2018.1.0b1, 2018.1.0b6, 2018.1.0b7,