@matt_behnken brings up a good point, which is that since your system it seems has never worked reliably, rather than working well for a while and then just mysteriously changing, there may be quite a few troubleshooting things you can do to improve the reliability.
So the first thing we need to know is the brand and model of the sensors which are acting goofy, as well as the brand and model of any smart bulbs that you have attached directly to the SmartThings hub.
Next, it would probably be a good idea to briefly review best practices for laying out your network backbone. Start with post number 11 in the following thread, read that, then go back up to the top of thread and read the whole thing.
Given the flaky platform problems this week, it would probably be best to put off actual troubleshooting for another couple of days until things settle down, but meanwhile you can do the initial research.
Also, you said you ordered four Hue bulbs: did you also order the hue bridge? If not, you should definitely get one, as otherwise you may actually make your problems worse.
