Do cucumbers get worn out?

I'm a novice cucumber grower.
I've got a Cucino in a 22L pot in my greenhouse. It's grown up the netting and across the width of the greenhouse.
I picked the first Cue on 15th June and since then I've had 251 cucumbers from the one plant
But for the last week the plant looks tired and there are no flowers or baby cucumbers forming.
Is that usual?
Thanks

Thanks mumofstig - I think it's done amazingly well - overwhelmed with cucumbers - the neighbours are glad to have a rest from them That's why I was wondering if it's exhausted and dying. It's only my 2nd year growing them.
I feed it weekly with Miracle-grow (as advised elsewhere on this forum) and just about everything gets seaweed extract every 10ish days. Rain water has been in short supply until a couple of days ago - I've now got about 800 litres of the stuff - hooray!
There's no new growth and the leaves are looking 'autumnal'

Ha-ha - thanks!!
Here's a pic from mid July when we were all getting fed up trying to think what else to have with cucumbers
For some reason I assumed they would go on producing 00's of fruits until the frosts! I guess that was expecting a bit much.
I sowed this year's seed on 14 Apr, next year I'll sow one a bit earlier and another in May, so hopefully when the first is done by end July, i can oik it out and start the next one up the trellis... that's the plan....

Yes, it's the stiff plastic clematis netting - I got it from Amazon. The pot sits on one end of it then it runs up to the eaves and across the width of the g/h. It's tied up in multiple places and has worked well.

Afraid to say though I think the plant has had it. All the leaves are yellowing now and it's looking rather sad.
I'll give it a few more days out of respect for its performance - there are 5 more cues still on it, so that'd make a total of - 256
Not bad from a single seed 
It'll take some beating next year, but I'll try