According with an email received today from Wantok Radio Light, they will be on air again on October 6:
"We have been off for a while but will resume our shortwave broadcast on October 6, 2018.
Please tune in after October 6 to pick up Wantok Radio light on 7325Khz. We would appreciate your confirmation on or after October 6, 2018.
Thank you and blessings to you and family.
Wantok Radio Light
93.9FM in Port Moresby and parts of Central Province
105.9FM rest of the country
7325 Khz on the Shortwave band
Internet livestreaming: www.wantok radio.org"