Print hitting infill

I've been printing PETG lately and I've noticed that I've been hitting/scraping the infill quite a lot. Is this normal when 3d printing? If so what can I do so that it doesn't happen much. My temp is currently at 228C and fans at 50% on NP4 pro, at 70% of default speed(250mm/s) and 0.3 layer height, cubic infill at 15%. Currently, its printing fine (except for some minor stringing cause there hasn't been a day when it didn't rain here for the past few months) but the scraping is kinda bothering me.