You may have fallen into a routine that feels like a chore. That also happens. Taking a break or changing routine works better. Running different routes, trying trails (highly recommended, I'm 90% trail runner, totally different experience), and adding some structure to your running (easy runs, fartlek, hills, strides) may help. I get bored very quickly so if it's not a structured workout I need to change routes (and usually, one loop, I hate running laps, and don't even sign up for races which include running laps). I run 5-6 times a week as part of my 16-week training plan so that's also different if you know what you're gonna be doing. You may sign up for a race and have it as your goal to train for. Running 3 times a week wouldn't probably burn me out but I guess we talking about different levels (3 times a week for me would be a big deload) so anything possible. Some runs will feel like crap, not every run feels great and that's also normal. I assume you do warm-up before runs.
Easy runs are those that your body not only can handle but when you finish you feel like you could add a few miles more (often called zone 2 runs), if your run isn't comfortable this isn't an easy run. That means you may have built up some fatigue that hasn't dropped yet. I train one guy who runs only 2-3 times a week each run increases his fatigue exponentially (tracking via TrainingPeaks, a great tool). He needs to take a day off between each running day just for his fatigue to drop and I prescribed him mostly easy running with optional strides at the end of each run to help increase his aerobic capacity (not ready for speed work or any kind of long intervals if can't run even an hour in easy effort). Every runner is different and may need a different approach to get through a wall (and that happens also to experienced athletes).
One more thing I want to ask, what is the purpose (goal) of your running?
