The weather has been quite warm, so it could be a thermal fault, but I was wondering if anyone had some anecdotal evidence of this behaviour before I confront the Sky phone wall.
Prepare for its imminent death, phone Sky, and they'll install a nice Kaon box.
Spark FibreMAX using Mikrotik CCR1009-8G-1S-1S+. UAP, UAP AC Pro, UAP AC Pro Mesh, Apple TV 4, Apple TV 4K, iPad Air 1, iPhone 6s, VodaTV Gen 2. If it doesn't move then it's data cabled.
They will replace it anyway, as it will be scheduled to be replaced. Call Sky and get it replaced before it dies completely.