Broadband extender become unreliable

[slast]

I have a broadband extender 600 and mini wifi home hotspot 600 which has stopped working reliably. 

I have attempted to reset both and am getting confusing results! 

I have the hotspot unplugged,  the extender plugged into a main socket and NO ethernet cable from the router. The power light is flashing with about 3.5 sec on and 0.5 sec off.    The data light also flashes briefly every few seconds. 

Pushing the link  button for more than 15 seconds makes no difference to anything. 

With the router connected, the ethernet flashes intermittently. 

With the home hotspot plugged in the pattern is the same. 

On the hotspot, the power light is steady, the wifi appears to be functioning but the wps/link light is not consistent  - took some minutes to come on and then internet connection is not reliable even if all three lights steady. 

Meanwhile back on the extender the light pattern has changed, power and data are steady but ethernet light is flickering .  Then a temporary reversion  to previous pattern with intermittent power. 

I am starting to suspect I need new units - these are about 5 (?) years old.   Any comments please?!? 

[Les-Gibson]

The only thing that comes to mind is your description of the factory reset process, the mini hotspot reset is achieved through a momentary press of a button through a pinhole on the side

[slast]

Thank you - I've decided to get replacements anyway - only £30 fromAmazon. Debated with myself whether to get a different brand but went with the same again for 2 reasons - I have a very tight space where the adapter goes  (have to move  filing cabinet to get access to that socket) and many other brands to be deeper with pass-through mains sockedts which I don't need; I do need 2 RJ45s on the other end for smart TV and recorder, and I guess there should not be any compatibility issues as the current ones worked pretty well in the past with my BT router, so if there are more issues I can have a moan at BT!