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I tested the default bt.spp demo app in WICED SDK 6.2.1, device goes in sniff mode once connected as it is a power save mode. But again enters the active mode after transmission starts and does not enter sniff mode again. You can find more details on low power sniff and active mode in Bluetooth spec or articles available online.
To answer your queries:
1. Sniff mode is a power saving mode, device automatically enters in it after some time.
2. There are no connectivity issues because of this.