First thing to try would be a factory reset. If the camera locks up before you can select it in its menus, it is still possible clear its settings-memory (cmos?) by leaving it without battery for a while. Actually don't know for how long you would need to leave it, as I accidentally discovered this option by storing my camera for a year (wanted to have it repaired for a similar lock-up problem, which turned out to not be necessary after all ^_^). You will know the memory was cleared when you have to re-select language and date+time when starting it again.

I had the same problem with my iPhone 15 Pro. I simply deleted the previous connection in the app and recreated it. Everything worked.

Hello 10 years later... So what I did is I cut the inner structure so it doesn't have to fit inside the body. Then I used a double sided tape. Poor camera even doesn't have a working screen. Or is it happy because I still care about it?

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I popped by my local camera store to check out the GRX100RF today.  They let me put my SD card in it and snap some pictures.  I set it to ACROS and snapped these shots of the salesman.  It's easy to see what camera brand he likes.

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I have a copy of Tamron’s 150 - 600mm G2 lens. It has really good image quality and is easy to use. I have heard the one you are asking about is similar. Will you be able to test it? The only drawback for me with my lens is after carrying it around for a while, it gets heavy and so on the tripod it goes. Also, it was not a FX mount lens, so I use a Fringer smart adapter, but that has never been a problem.