1. 'In recent few years' is wrong, so 'over the past few years' is definitely an improvement.
2. You might hear, 'some problem has been increasing' or something similar, but it's not usually right. It could be acceptable in so far as a problem can be big or small.
What is usually meant is that the size of the problem is increasing, or that its intensity/seriousness is increasing.
Student or Learner