Weird leak, pressure?

[ctfrancis]

Hi,
I have a strange small leak in my kitchen.
It started off as I noticed a puddle of water on the floor by the dishwasher. Having pulled it out the wetness seemed to come from the water inlet by the washing machine valve. Tightened both ends and was dry for all day. Next morning same thing, puddle. I swapped the hose for a new one and all seemed well for 2 weeks or so then one morning puddle again. Strange as it was fine for that time. Pulled it out again and this time was leaking by the dishwasher end.
Anyhow I turned off the valve to the dishwasher and left it, manual washing up!
Forward another couple of weeks and now noticed in the morning a puddle under the sink dripping from the connection to the washing machine. There is block attached to the hose which I'm not sure what this is.
I'm stumped as it has never leaked there before and it only happens at night, and seemed odd that it has occurred after I turned the dishwasher valve off, if the two are linked? Please help, thanks

 

[Whitespirit66]

Hard to visualise from text. I think some snaps may get more replies, especially identifying the mystery 'block'.

 

[ctfrancis]

Untitled

• ctfrancis
• 2 Feb 2014
• 1

Hose is like above.

Sorry if not clear from my OP.
I guess I'm asking why would something leak all of a sudden only at night from two seperate locations when it was fine before. I cannot tighten the connections any more. They don't leak during the day.
Could this be related to too high pressure?

 

[gigz]

Pressure usually increases during the night (less demand) so this could be it. You say you can't tighten it up anymore ? You shouldn't over tighten these really.