325i electrical problems driving me crazy

I have a Bmw 325i coup (07 Plate) and I have the following problem with it and I hope that you can help me out?

All of the issues below have been happening over a period of about ten weeks…
A while ago I started to notice that the car clock started to show 00.00 when I got in to it (about once a week) I would reset it to the correct time and all was well for a week or so! I would also lose all pre-programmed setting I.e trip milage, average fuel consumption and seat settings.
Then after driving the car sort or long journey, once I stop the engine and got out to lock it the car with the remote the car would lock and the alarm would go off about ten times… During that time of the alarm going off, the remote wouldn't work to stop it from sounding after the alarm stopped sounding all would work ok, but still had to reset the settings as stated in bullet point 1
This didn't happen all the time about three times a week
One night I drove home and locked the car, and the next day the car was completely dead and I had to use the key to get in, once in nothing at all not a single light came on, Called green flag and he told me it was the battery and sold me a new one… all was fine for about four weeks and the issues on bullet points 1 and 2 stared to happen again.
Just before christmas (20t Dec) I drove about half a mile up the road and parked the car up for about a hour when I returned to the car it was completely dead no power not even the hazards worked. Called green Flag and had the car towed home, no power in the car at all nothing worked at all!!
The next day I came home in my partners car and notice that the cars alarm LED was flashing… I got my keys and pressed the button to unlock it.. To my amazement the locks popped up, put the fob in the hole and the car started straight away…
I haven't got the confidence to drive the car and need it fixing asap. (it has started everyday since)
On the last time the car stopped working I unscrewed the panel under the glovebox and discounted a blue multiway connector block, after ten seconds I reconnected the block and heard relays click and the car started first time since then the cars has had the same issue.
I actually believe it could be a faulty main relay or an intelligent battery switch (IBS) that is the cause of all my problems!

P.s Just thought I would mention this, on one occasion of the car not working, I hit the dashboard and heard a noise and all the electrics came on!! And the car started!!

just an update i have had the car in at two bmw garages now and they run all the test and cant find a fault!!!

any thoughts please help

Post this to the E90 Forum, you`ll get the best answers there....

Thanks bob will do