Getting the same problem on my instance. Sometimes 30-40 times per day.
TypeError: Failed to construct 'Notification': Illegal constructor. Use ServiceWorkerRegistration.showNotification() instead.
at https://swapd.co/assets/application-a9a1b96b84ba77c33f26b7f4974eff035fd81fee0da6503e09f7e84e2d2a6b53.js:12:16333
at h (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:18:1869)
at C (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:18:3255)
at https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:18:3745
at e.invoke (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:11634)
at e.flush (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:10577)
at e.flush (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:12677)
at e._end (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:17457)
at MutationObserver._boundAutorunEnd (https://swapd.co/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:13591)