It is not a standard behaviour. Having done a migration, you should get a heavy support from ALU engineering teams, you should quickly check with them.
Usually, i recommend a TRX/RSL/BTS reset, but if it comes and goes by itself then there is perhaps another issue.
we have alcatel support but since ten days they were not able do fix it, and they made only TCUC restart and problem is still there, could i fix this problem by having some traces, if so A interface or Air?
have you tried the actions on the BTS, rather than the TCUC ? Locating the SDCCH ts on another ts ?
Abis trace would show the contents of the channel requests which are subsequently lost (cause estab, timing advance,..). But I’m not sure you’ll find anything interesting here… who knows, you still can try 🙂
Can you please check the main usage of the SDCCH Request (MC02 x) : loc upd ? MOC ? MTC ? SMS ?
During the fail time, do you notice anything different about this distribution ?