Like you, I too have experienced problems with my Bosch vacuum cleaner, though mine isn't a cordless one - it's an earlier model bagless one. Works well for the most part, but it has a plethora of filters (including a HEPA filter) which clog up in no time at all, which shuts the unit down into low power (waste of time using it) mode.
The main sponge filter HAS to be cleaned thoroughly in soapy water and carefully squeezed dry (it'll tear/break if you wring it out like an ordinary sponge), then left to dry for at least 24 hrs until completely dry; the other small filter off the dirt bin has to be brushed clean with an old (dry) toothbrush just as often to avoid the cutout scenario. The HEPA filter needs to be soaked in soapy water (obviously rinsed as the other sponge one in cold clean water) and again left to dry for 24 hrs.
It's an absolute pain in the backside if this goes (no warning with loss of suction - that only happens when the bin is full) when you're in the middle of cleaning a room. No cleaning at all for 24+ hrs. And you have to clean up the mess from opening the unit up to remove and clean the filters.
I can't say what the cordless ones are like and if they've changed the tech, but the floor bagless ones don't look like they've changed that much in 3-4 years. I'd rather go back to an old style bagged upright from Sebo (expensive, but good quality) or floor cylinder units from Numatic (Henry and Co - never had a problem with these at more than one workplace or college residences) or Miele (above average price, but v.good).
If you do decide to get a bagged unit, make sure you source quality but value-for-money replacement bags beforehand, as some makes can charge quite a lot for them (why I went for a bagless one in the first place). Some shops like Wilko may sell own brand equivalent replacement bags that are cheaper, a bit like firms selling compatable ink cartridges for printers for a lot less than the original manufacturers.
From people I've spoken to, Dysons are great in operation, but are average at best for reliability and longevity. I'll probably get a Miele or Sebo next time. My faith in Bosch has diminished over the last few years, as they seem to be starting to reduce quality to be a mass market manufacturer (never mind their involvement in Dieselgate) - and I have an oven, fancy kettle and car windscreen wipers from them. The others seem to work fine, so maybe its only certain sectors.
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