I had the same problem with my PA1000. Unfortunately, whilst the range was getting smaller and smaller, it finally packed up when the car was locked in a multi story car park in Coventry the day before I was due to do this year's track day at Silverstone. I could get in the car using the key, but couldn't remobilise. To cut a long story short, I missed the track-day, and had to get towed all the back home to London (ironically, passing signs to Silverstone on the M40). You're lucky the car was in your garage when it happened. I had tried different fobs - didn't help. Looked like my H&P circuit board had gone. Rather than replace it with another H&P circuit board, I just had the whole PA1000 alarm replaced with another more modern alarm. Can't remember which exactly - but it does come with a seperate electronic key that can remobilise the car should any similar problem happen again. RAS Cars just South East of London sorted it all out. Was about £300 for new alarm plus labour. Still not as costly as missing a day at Silverstone. Ho hum. At least the PCGB Motorsport lot were kind enough to let me go on this Saturday's track day at Castle Combe for free instead.