‘14GX 460 80k miles. Purchased at 69k miles. other than oil changes nothing else has been done. Two codes showing: P0705 & P2610

-not a daily driver, driven once or twice a week in town for several miles. Mostly longer trips.

• Handful of times but now more often ‘D’ will not light up on Dash. All the other PNR etc. would light up fine, operate. Slightly harder it seems to move the Gear handle shifter.
• Have driven few 300+ miles in high way trips while no D showing.
• Back up camera will be blank at times,
• In two instance; first occur in highway 70mph when increase speed the rpm revved higher however speed stayed steady did not increase at it should have usually.
• Recently, In town when accelerate from standstill it would rev up rpm, and slowly move. Take few seconds extra to speed up. However when turn the car off and drive no issue.

Linkage issue? Transmission? Sensor? Rust inside shifter console? Transmission fluid change/flush or filter change? Carfax report or previous history do not show anything major has been done. Battery does need to be replaced soon and intend to.
Anyone experienced this? Or Has any input before I take it to shop. Would love any feedback positive or negative. Thank you for taking the time to reading and responding.