Problem with ST2000DL003 after upgrading NV+

I've backed up everything because i never again trust this ReadyNAS. Only bad thing would be that all timestamps of each files will be lost. :roll:

I cant connect these drives to my computer, because I cant read such big drives. Don't know why.

"Current Pending" stays zero on all drives.
There is no indication that the drives has any error. but every time I try to read or write some data it increases the "drive reset" counter and while doing so all data transfers are stuck for some seconds.

SMART-Attribute Spin Up Time 0 Start Stop Count 12 Reallocated Sector Count 0 Power On Hours 184 Spin Retry Count 0 Power Cycle Count 10 G-Sense Error Rate 0 Power-Off Retract Count 8 Load Cycle Count 12 Temperature Celsius 36 Current Pending Sector 0 Offline Uncorrectable 0 UDMA CRC Error Count 0 Head Flying Hours 21835613733048 ATA Error Count 0

Drive resets are now up to 860. What does this mean? Is this ok, or is this bad?
Do I have to RMA the drives or are they ok? Is it again in incompatibility I found afterwards?

There must be someone who can tell me if I own some bricks or a good data storage! :evil:

And one question. Can I go back to my old 4 drives by replacing the new ones while the NV+ is powered off and just reboot? These are full but are runnin stable!