Denwyn....you seem to connect the fault with the bike suddenly becoming hard to pedal. That could be just loss of power or brakes binding or they could be connected. One of the most common faults is the power cutout sensor on the brake pedal,or sometimes located in the rear brake line.
If this sensor locks on the electrics think you are operating the brake and cuts the motor power even if you are not operating the brake lever.
Why this would delete all power on the PAS I cannot say,I don't know your bike that well.
With regard to using your bike every week to maintain the battery,that is complete rubbish. If that was the case I would need an army of test riders to keep all my stock bikes topped up,obviously impossible.
We have a system of storing the batteries remote from the bike,it's someone's job to check the batteries on a rota basis,any that falls below 40 per cent is charged and stored separately,if that battery keeps losing its charge it is rejected,maybe 1 in 50,most batteries keep their charge for 6 months with minimal loss per month.
The golden rule is 80-20,you should leave your battery in a state of 80-20 per cent of maximum. Our advice to our customers is,if you are going to store the bike away for the winter,charge it to maximum,go for a 20 minute ride to take the top off the charge,then leave it,ie about 80 per cent. Do a battery check a couple of times over the winter,never let it fall below 20 per cent,that is too close to flat and a risk of damage.
I have thousands of Kudos batteries out with my customers,they all should abide by the 80-20 rule and we have minimal battery problems.
I am about to go out to my boat,left over the winter,neither of my Kudos Secret bikes will have been ridden over the winter,I have the maintenance guy check the batteries a couple of times over the winter and a local bike shop give the bike a service before I use it,all sensible stuff.
The batteries do lose a bit of range over the years but a sudden loss of power is due to a faulty battery,normally a rogue cell,not about usage,unless you have let the battery go completely flat....D8veh is the expert of these things,he is good about 'waking up' batteries.
KudosDave