I also have a 2005 Laguna. And had the same problem.Turned out it was the battery.
Charging it wasn't a solution.
Changed it out and no more problems.
Weak battery Loose or corroded battery cables
Jump it, there is not enough power to starter. Ensure alternator and battery are good.
Sounds like bad battery connections, clean and tighten them and try again. Have the battery checked if no luck ++ Loose connections ++ This just happened to my laguna. The two connections giving power to the starter motor were loose. Couple of quick turns and it fired up first time. Took an hour to get to it as it's buried deep in the engine.
Bolted to the engine at the end of the ignition wire
You can go to www.performancebatteries.co.uk and enter the year and make and it will tell you the exact battery your Laguna uses.
Renault Laguna was created in 1993.
battery is loosing power, probably there is power thief
Starter i located on the back of the engine - between manifold and driveshaft.
Is a Renault Laguna a front wheel drive
clutch adjustment renault laguna 02 reg
Starter is located to the rear of the engine,under the exhaust manifold.Three bolts attatch it the the gearbox,access to these is from above, in the engine bay.
Your alternator is defective and not recharging the battery. Have the alternator checked.