I’ve maintained that the decline in the Ringgit is largely a function of the decline in global oil prices. Here’s some proof (or to be more precise, corroborating evidence):
The above charts show daily price movements of a barrel of Brent crude (in USD terms) and the USD/MYR exchange rate (in MYR terms) since 2012. The graphs are fairly similar, with a positive correlation of 60.5% between the two series.