Narinder Singh was admitted as a lawful permanent resident, and less than 7 years later, convicted of a crime of involving moral turpitude. He subsequently traveled outside the United States, was readmitted as a lawful permanent resident, and more than 7 years later, was served with a Notice to Appear, charging him with removability based on his conviction. He applied for cancellation of removal for lawful permanent residents, arguing that he had accrued the requisite 7 years in any status when he returned from his post-conviction trip abroad. The Immigration Judge and the Board of Immigration Appeals disagreed, finding that his conviction "stopped the clock" on his accrual of 7 years of continuous residency after admission in any status, and that he could not start that clock again by traveling and being readmitted.
The Third Circuit agreed, finding that because Singh was charged with removability based on his criminal conviction, the clock was permanently stopped by the conviction. The Court did acknowledge that its precedent would have allowed Singh to re-start his clock by traveling abroad if he were charged with a ground of removability unrelated to his criminal conviction.
The full decision of Singh v. Lynch can be found here: http://www2.ca3.uscourts.gov/opinarch/151152p.pdf