I can only assume with a low battery the communications between devices goes a bit hit or miss like when you have poor signal on your radio, and the panel/receiver see this a jamming.
The armour is for protection not stopping EMF.
should not be run together and segregated as they are different voltage bands, unless all cables are rated for the higher voltage band.
all your cabling should be installed to BS7671
https://www.tlc-direct.co.uk/Products/CACAT5EslashSWA.html?ad_position=1o2&source=adwords&ad_id=45425533757&placement=&kw=&network=g&matchtype=&ad_type=pla&product_id=CACAT5E%2fSWA&product_partition_id=74607868747&test=finalurl_v2&gclid=CPePwP7I88wCFckaGwodw60LAA
just dig trench and lay in
When in auto mode the detectors go to sleep for 3-15 min after detection, however the system is set.
for best results put them in hybrid mode, asleep when not needed and awake when set.
It's all wireless and none of it can be wired. The only one with mains is the little control panel thing with sim card in, which has a mains plug in adapter.
Why would you avoid Galaxy ?
Unfortunately there will be no cables to disconnect or reuse as the picture shows the Honeywell lesucre wireless system. I'm not sure but I think the wireless PIR & door contacts can be used with the galaxy wireless range but fitting a pro panel is not for the DIYer.
http://www.security.honeywell.com/uk/products/intruder/control-panels/le-sucre/
If you have a read of the manual it states a Guard Access zone will start the part set entry timer when system is part set. I personally use entry/exit 2 attribute and never had a problem.
Your down stairs hall PIR needs the "Part set" (1,2 or 3) attribute removing and the "Entry/Exit 2" attribute adding.
Your installer should be able to do this in around 5 min or if you have programed it yourself you need to look in the zones section of manual.
You will just have to wait until the new firmware is released from Texecom.
You are not the only one to experience the problems but don't worry Texecom will get it sorted.
If you turn off push notifications for now you can still fully use the app locally & remotely and the 'system alert' will stop.
Is your router the talk talk supplied unit? Not that it should matter.
Reverse engineer what? It's just an interface. The reason it's probably £30 is because it's sold in very low volumes.
Buy one, use it, drink your beer and move on.