Has anyone else having trouble with fleas at the moment. We get a frontline subscription so every 4 weeks we treat as soon as it gets delivered. We noticed cat was scratching and youngest had a couple of bites so I've stepped up the hoovering flea sprayed the house washing everything and did an extra treatment 2 weeks after his last one and the bastards are still here. I wondered if anyone who uses frontline was having a similar issue and they've just become resistant to it again.