Ads issue (fist Ad is playing, but next - don't)

Hi.

I'm using Roku_Ads library to show Ads inside the application. All was good, but recently (maybe month ago) I start to notice strange issue. First time the Ad works fine. But if I call it next time it just makes a getStringFromUrl request (according to logs) and that's it. Nothing happens, application freezes.

I have tried to create just a blank test application without any additional logic. Just to test Ads behavior. I'm just init it like this:

adIface = Roku_Ads()
adIface.setDebugOutput(true)
adIface.setAdUrl({{Google test VAST tag here}})

And then call it:

adPods = adIface.getAds()
result = adIface.showAds(adPods)

Does anyone had the same issue recently?