The correct initial troubleshooting step is to check the printer’s toner cartridges and imaging drums for defects or leakage since issues related specifically to particular printer consumables, such as the toner or imaging drums, can cause intermittent quality problems like blurry or smudged images. Since the problem is not consistent, it suggests that it might not be related to software settings or permanent hardware failure. The deformation of an imaging drum or uneven distribution of toner on a cartridge may only affect prints occasionally, which aligns with user reports. Changing paper types would not likely resolve print quality issues such as blurriness or smudging. Updating printer firmware should be considered if hardware issues are ruled out, whereas checking the fuser unit would generally resolve issues with toner not adhering to the page.