I'd be surprised.
First of all if confirm its not environmental. Can you swap 2 units over ie between rooms?
If not if completly mask the lens and are if it continues. There are many more likely reasons before if suspect interference.
What is dispalyed on the panel.
Your install manual will tell you haw to factory reset it if needed, obviously we cant say on a public forum.
But i doubt a reset will help unless you have programmed something wrong.
if using standalone floods with sensors i doubt any will have the switching capacity needed.
If using voltek low voltage pirs and switchers then it will be fine, but you will need to run a lv cable to the heads and a mains cable for the floods.
Dan
Yes
touch tone phone yes
If it has the gsm expander yes.
SOme panels do sms texting from the built in modem over the landline, unfortunatly the powermax does not.
The 500r uses a hardwired bell. Any of the 12v intruder sab's will be fine. But look for lower power consumption due to the small psu etc,
ie honeywell ag6
WHat the signal strength to the bell. Could be a range issue. Might be worth temp fitting it by the panel to see how it performs. If all is ok you will need to relocate the bell.
COuld be battery but as they are monitored if expect a battery fault rather than it going missing.
the pm gsm module laows full integration for signalling etc
the cqr dialler is more of a standalone etc unit that will need outputs from the panel to trigger it.
im sure you can build your own, but its not semething i have done.
I do recall the excel having udl options in the past not sure if that still relevant.
The premier is defienetly fully supported via wintex.
Yes
The 9940 has become the 9943
http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=632
Yes pretty much any pro hard wired detector will work
a cheap one, id recommend the honeywell AG6 / 8